mailsrvr.c

		/* Add to Recipient list */
		if(!strnicmp(buf,"RCPT TO:",8)) {

			if(state<SMTP_STATE_MAIL_FROM) {
				lprintf("%04d !SMTP MISSING 'MAIL' command",socket);
				sockprintf(socket, badseq_rsp);
				continue;
			}

			if(spy==NULL && trashcan(&scfg,reverse_path,"smtpspy")) {
				sprintf(str,"%sSMTPSPY.TXT", scfg.data_dir);
				spy=fopen(str,"a");
			}

			p=buf+8;
			while(*p && *p<=' ') p++;
			SAFECOPY(str,p);
			p=strrchr(str,'<');
			if(p==NULL)
				p=str;
			else
				p++;

			truncstr(str,"> ");

			forward=FALSE;
			no_forward=FALSE;
			if(!strnicmp(p,FORWARD,strlen(FORWARD))) {
				forward=TRUE;		/* force forward to user's netmail address */
				p+=strlen(FORWARD);
			}
			if(!strnicmp(p,NO_FORWARD,strlen(NO_FORWARD))) {
				no_forward=TRUE;	/* do not forward to user's netmail address */
				p+=strlen(NO_FORWARD);
			}

			rcpt_name[0]=0;
			SAFECOPY(rcpt_addr,p);

			/* Check recipient counter */
			if(rcpt_count>=startup->max_recipients) {
				lprintf("%04d !SMTP MAXIMUM RECIPIENTS (%d) REACHED"
					,socket, startup->max_recipients);
				sprintf(tmp,"Maximum recipient count (%d) from: %s"
					,startup->max_recipients, reverse_path);
				spamlog(&scfg, "SMTP", "REFUSED", tmp, host_name, host_ip, rcpt_addr);
				sockprintf(socket, "552 Too many recipients");
				continue;
			}

			/* Check for blocked recipients */
			if(trashcan(&scfg,rcpt_addr,"email")) {
				lprintf("%04d !SMTP BLOCKED RECIPIENT (%s) from: %s"
					,socket, rcpt_addr, reverse_path);
				sprintf(str,"Blocked recipient e-mail address from: %s"
					,reverse_path);
				spamlog(&scfg, "SMTP", "REFUSED", str, host_name, host_ip, rcpt_addr);
				sockprintf(socket, "550 Unknown User:%s", buf+8);
				continue;
			}

			if(dnsbl_result.s_addr && startup->options&MAIL_OPT_DNSBL_BADUSER) {
				lprintf("%04d !SMTP REFUSED MAIL from blacklisted server"
					,socket);
				sprintf(str,"Listed on %s as %s", dnsbl, inet_ntoa(dnsbl_result));
				spamlog(&scfg, "SMTP", "REFUSED", str, host_name, host_ip, rcpt_addr);
				sockprintf(socket
					,"550 Mail from %s refused due to listing at %s"
					,host_ip, dnsbl);
				continue;
			}

			/* Check for full address aliases */
			p=alias(&scfg,p,alias_buf);
			if(p==alias_buf) 
				lprintf("%04d SMTP ADDRESS ALIAS: %s",socket,p);

			tp=strrchr(p,'@');
			if(cmd==SMTP_CMD_MAIL && tp!=NULL) {
				
				/* RELAY */
				dest_port=server_addr.sin_port;
				SAFECOPY(dest_host,tp+1);
				cp=strrchr(dest_host,':');
				if(cp!=NULL) {
					*cp=0;
					dest_port=atoi(cp+1);
				}
				sprintf(domain_list,"%sdomains.cfg",scfg.ctrl_dir);
				if((stricmp(dest_host,scfg.sys_inetaddr)!=0
						&& resolve_ip(dest_host)!=server_addr.sin_addr.s_addr
						&& findstr(dest_host,domain_list)==FALSE)
					|| dest_port!=server_addr.sin_port) {

					sprintf(relay_list,"%srelay.cfg",scfg.ctrl_dir);
					relay_user.number=userdatdupe(&scfg, 0, U_NOTE, LEN_NOTE, host_ip, FALSE);
					if(relay_user.number!=0)
						getuserdat(&scfg,&relay_user);
					if(p!=alias_buf /* forced relay by alias */ &&
						(!(startup->options&MAIL_OPT_ALLOW_RELAY)
							|| relay_user.number==0
							|| relay_user.laston < time(NULL)-(60*60)
							|| relay_user.rest&(FLAG('G')|FLAG('M'))) &&
						!findstr(host_name,relay_list) && 
						!findstr(host_ip,relay_list)) {
						lprintf("%04d !SMTP ILLEGAL RELAY ATTEMPT from %s [%s] to %s"
							,socket, reverse_path, host_ip, p);
						sprintf(tmp,"Relay attempt from: %s to: %s"
							,reverse_path, p);
						spamlog(&scfg, "SMTP", "REFUSED", tmp, host_name, host_ip, rcpt_addr);
						if(startup->options&MAIL_OPT_ALLOW_RELAY)
							sockprintf(socket, "553 Relaying through this server "
							"requires authentication.  "
							"Please authenticate with POP3 before sending.");
						else
							sockprintf(socket, "550 Relay not allowed.");
						break;
					}

					if(relay_user.number==0)
						SAFECOPY(relay_user.alias,"Unknown User");

					lprintf("%04d SMTP %s relaying to external mail service: %s"
						,socket, relay_user.alias, tp+1);

					fprintf(rcptlst,"0\n%.*s\n%.*s\n"
						,(int)sizeof(rcpt_name)-1,rcpt_addr
						,(int)sizeof(rcpt_addr)-1,p);
					
					sockprintf(socket,ok_rsp);
					state=SMTP_STATE_RCPT_TO;
					rcpt_count++;
					continue;
				}
			}
			if(tp!=NULL)
				*tp=0;	/* truncate at '@' */

			while(*p && !isalnum(*p)) p++;	/* Skip '<' or '"' */
			truncstr(p,"\"");	

			p=alias(&scfg,p,name_alias_buf);
			if(p==name_alias_buf) 
				lprintf("%04d SMTP NAME ALIAS: %s",socket,p);
		
			if(!strnicmp(p,"sub:",4)) {		/* Post on a sub-board */
				p+=4;
				for(i=0;i<scfg.total_subs;i++)
					if(!stricmp(p,scfg.sub[i]->code))
						break;
				if(i>=scfg.total_subs) {
					lprintf("%04d !SMTP UNKNOWN SUB-BOARD: %s", socket, p);
					sockprintf(socket, "550 Unknown sub-board: %s", p);
					continue;
				}
				subnum=i;
				sockprintf(socket,ok_rsp);
				state=SMTP_STATE_RCPT_TO;
				rcpt_count++;
				continue;
			}

			usernum=0;	/* unknown user at this point */
			if(startup->options&MAIL_OPT_ALLOW_RX_BY_NUMBER 
				&& isdigit(*p)) {
				usernum=atoi(p);			/* RX by user number */
				/* verify usernum */
				username(&scfg,usernum,str);
				if(!str[0] || !stricmp(str,"DELETED USER"))
					usernum=0;
				p=str;
			} else {
				/* RX by "user alias", "user.alias" or "user_alias" */
				usernum=matchuser(&scfg,p,TRUE /* sysop_alias */);	

				if(!usernum) { /* RX by "real name", "real.name", or "sysop.alias" */
					
					/* convert "user.name" to "user name" */
					SAFECOPY(rcpt_name,p);
					for(tp=rcpt_name;*tp;tp++)	
						if(*tp=='.') *tp=' ';

					if(!stricmp(p,scfg.sys_op) || !stricmp(rcpt_name,scfg.sys_op))
						usernum=1;			/* RX by "sysop.alias" */

					if(!usernum && scfg.msg_misc&MM_REALNAME)	/* RX by "real name" */
						usernum=userdatdupe(&scfg, 0, U_NAME, LEN_NAME, p, FALSE);

					if(!usernum && scfg.msg_misc&MM_REALNAME)	/* RX by "real.name" */
						usernum=userdatdupe(&scfg, 0, U_NAME, LEN_NAME, rcpt_name, FALSE);
				}
			}
			if(!usernum && startup->default_user[0]) {
				usernum=matchuser(&scfg,startup->default_user,TRUE /* sysop_alias */);
				if(usernum)
					lprintf("%04d SMTP Forwarding mail for UNKNOWN USER to default user: %s"
						,socket,startup->default_user);
				else
					lprintf("%04d !SMTP UNKNOWN DEFAULT USER: %s"
						,socket,startup->default_user);
			}

			if(!usernum) {
				lprintf("%04d !SMTP UNKNOWN USER:%s", socket, buf+8);
				sockprintf(socket, "550 Unknown User:%s", buf+8);
				continue;
			}
			user.number=usernum;
			if((i=getuserdat(&scfg, &user))!=0) {
				lprintf("%04d !SMTP ERROR %d getting data on user #%u (%s)"
					,socket, i, usernum, p);
				sockprintf(socket, "550 Unknown User:%s", buf+8);
				continue;
			}
			if(user.misc&(DELETED|INACTIVE)) {
				lprintf("%04d !SMTP DELETED or INACTIVE user #%u (%s)"
					,socket, usernum, p);
				sockprintf(socket, "550 Unknown User:%s", buf+8);
				continue;
			}
			if(cmd==SMTP_CMD_SEND) { /* Check if user online */
				for(i=0;i<scfg.sys_nodes;i++) {
					getnodedat(&scfg, i+1, &node, 0);
					if(node.status==NODE_INUSE && node.useron==user.number
						&& !(node.misc&NODE_POFF))
						break;
				}
				if(i>=scfg.sys_nodes) {
					lprintf("%04d !Attempt to send telegram to unavailable user #%u (%s)"
						,socket, user.number, user.alias);
					sockprintf(socket,"450 User unavailable");
					continue;
				}
			}
			if(cmd==SMTP_CMD_MAIL) {
#if 0	/* implement later */
				if(useron.etoday>=cfg.level_emailperday[useron.level]
					&& !(useron.rest&FLAG('Q'))) {
					bputs(text[TooManyEmailsToday]);
					continue; 
				}
#endif
			} else
				telegram=TRUE;

			fprintf(rcptlst,"%u\n%.*s\n"
				,user.number,(int)sizeof(rcpt_name)-1,rcpt_addr);

			/* Forward to Internet */
			tp=strrchr(user.netmail,'@');
			if(!telegram
				&& !no_forward
				&& scfg.sys_misc&SM_FWDTONET 
				&& (user.misc&NETMAIL || forward)
				&& tp && strchr(tp,'.') && !strchr(tp,'/') 
				&& !strstr(tp,scfg.sys_inetaddr)) {
				lprintf("%04d SMTP Forwarding to: %s"
					,socket, user.netmail);
				fprintf(rcptlst,"%s\n",user.netmail);
				sockprintf(socket,"251 User not local; will forward to %s", user.netmail);
			} else { /* Local (no-forward) */
				fprintf(rcptlst,"#%u\n",usernum);
				sockprintf(socket,ok_rsp);
			}
			state=SMTP_STATE_RCPT_TO;
			rcpt_count++;
			continue;
		}
		/* Message Data (header and body) */
		if(!strnicmp(buf,"DATA",4)) {
			if(state<SMTP_STATE_RCPT_TO) {
				lprintf("%04d !SMTP MISSING 'RCPT TO' command", socket);
				sockprintf(socket, badseq_rsp);
				continue;
			}
			if(msgtxt!=NULL)
				fclose(msgtxt);
			sprintf(msgtxt_fname,"%sSMTP%d.RX", scfg.data_dir, socket);
			if((msgtxt=fopen(msgtxt_fname,"w+b"))==NULL) {
				lprintf("%04d !SMTP ERROR %d opening %s"
					,socket, errno, msgtxt_fname);
				sockprintf(socket, "452 Insufficient system storage");
				continue;
			}
			/* These vars are potentially over-written by parsing an RFC822 header */
			/* get sender_addr */
			p=strchr(reverse_path,'<');
			if(p==NULL)	
				p=reverse_path;
			else 
				p++;
			SAFECOPY(sender_addr,p);
			truncstr(sender_addr,">");
			/* get sender */
			SAFECOPY(sender,sender_addr);
			if(truncstr(sender,"@")==NULL)
				sender[0]=0;

			sockprintf(socket, "354 send the mail data, end with <CRLF>.<CRLF>");
			if(telegram)
				state=SMTP_STATE_DATA_BODY;	/* No RFC headers in Telegrams */
			else
				state=SMTP_STATE_DATA_HEADER;
			continue;
		}
		sockprintf(socket,"500 Syntax error");
		lprintf("%04d !SMTP UNSUPPORTED COMMAND: '%s'", socket, buf);
		if(++badcmds>9) {
			lprintf("%04d !TOO MANY INVALID COMMANDS (%u)",socket,badcmds);
			break;
		}
	}

	/* Free up resources here */
	smb_freemsgmem(&msg);

	if(msgtxt!=NULL) {
		fclose(msgtxt);
		if(!(startup->options&MAIL_OPT_DEBUG_RX_BODY))
			unlink(msgtxt_fname);
	}
	if(rcptlst!=NULL) {
		fclose(rcptlst);
		unlink(rcptlst_fname);
	}
	if(spy!=NULL)
		fclose(spy);

	status(STATUS_WFC);

	active_clients--;
	update_clients();
	client_off(socket);

	thread_down();
	lprintf("%04d SMTP RX Session thread terminated (%u threads remain)"
		,socket, thread_count);

	/* Must be last */
	mail_close_socket(socket);
}

BOOL bounce(smb_t* smb, smbmsg_t* msg, char* err, BOOL immediate)
{
	char		str[128];
	char		attempts[64];
	int			i;
	ushort		agent=AGENT_SMTPSYSMSG;
	smbmsg_t	newmsg;

	if((i=smb_lockmsghdr(smb,msg))!=0) {
		lprintf("0000 !BOUNCE ERROR %d (%s) locking message header #%lu"
			,i, smb->last_error, msg->hdr.number);
		return(FALSE);
	}

	msg->hdr.delivery_attempts++;
	if((i=smb_putmsg(smb,msg))!=0) {
		lprintf("0000 !BOUNCE ERROR %d (%s) incrementing delivery attempt counter"
			,i, smb->last_error);
		smb_unlockmsghdr(smb,msg);
		return(FALSE);
	}

	lprintf("0000 !Delivery attempt #%u FAILED for message #%lu from %s to %s"
		,msg->hdr.delivery_attempts, msg->hdr.number
		,msg->from, msg->to_net.addr);

	if(!immediate && msg->hdr.delivery_attempts<startup->max_delivery_attempts) {
		smb_unlockmsghdr(smb,msg);
		return(TRUE);
	}

	newmsg=*msg;
	/* Mark original message as deleted */
	msg->hdr.attr|=MSG_DELETE;
	msg->idx.attr=msg->hdr.attr;
	if((i=smb_putmsg(smb,msg))!=0) {
		lprintf("0000 !BOUNCE ERROR %d (%s) deleting message"
			,i, smb->last_error);
		smb_unlockmsghdr(smb,msg);
		return(FALSE);
	}
	if(msg->hdr.auxattr&MSG_FILEATTACH)
		delfattach(&scfg,msg);
	smb_unlockmsghdr(smb,msg);

	if(msg->from_agent!=AGENT_PERSON	/* don't bounce 'bounce messages' */
		|| (msg->idx.from==0 && msg->from_net.type==NET_NONE)
		|| (msg->reverse_path!=NULL && *msg->reverse_path==0)) {
		lprintf("0000 !Deleted undeliverable message from %s", msg->from);
		return(TRUE);
	}
	
	lprintf("0000 !Bouncing message back to %s", msg->from);

	newmsg.hfield=NULL;
	newmsg.hfield_dat=NULL;
	newmsg.total_hfields=0;
	newmsg.idx.to=newmsg.idx.from;
	newmsg.idx.from=0;
	newmsg.hdr.delivery_attempts=0;

	sprintf(str,"Delivery failure: %.100s",newmsg.subj);
	smb_hfield(&newmsg, SUBJECT, (ushort)strlen(str), str);
	smb_hfield(&newmsg, RECIPIENT, (ushort)strlen(newmsg.from), newmsg.from);
	if(newmsg.idx.to) {
		sprintf(str,"%u",newmsg.idx.to);
		smb_hfield(&newmsg, RECIPIENTEXT, (ushort)strlen(str), str);
	}
	if(newmsg.from_net.type!=NET_NONE && newmsg.from_net.type!=NET_FIDO
		&& newmsg.reverse_path!=NULL) {
		smb_hfield(&newmsg, RECIPIENTNETTYPE, sizeof(newmsg.from_net.type)
			,&newmsg.from_net.type);
		smb_hfield(&newmsg, RECIPIENTNETADDR, (ushort)strlen(newmsg.reverse_path)
			,newmsg.reverse_path);
	}
	strcpy(str,"Mail Delivery Subsystem");
	smb_hfield(&newmsg, SENDER, (ushort)strlen(str), str);
	smb_hfield(&newmsg, SENDERAGENT, sizeof(agent), &agent);
	
	/* Put error message in subject for now */
	if(msg->hdr.delivery_attempts>1)
		sprintf(attempts,"after %u attempts", msg->hdr.delivery_attempts);
	else
		attempts[0]=0;
	sprintf(str,"%s reporting delivery failure of message %s"
		,startup->host_name, attempts);
	smb_hfield(&newmsg, SMTPSYSMSG, (ushort)strlen(str), str);
	sprintf(str,"from %s to %s\r\n"
		,msg->reverse_path,(char*)msg->to_net.addr);
	smb_hfield(&newmsg, SMTPSYSMSG, (ushort)strlen(str), str);
	strcpy(str,"Reason:");
	smb_hfield(&newmsg, SMTPSYSMSG, (ushort)strlen(str), str);
	smb_hfield(&newmsg, SMTPSYSMSG, (ushort)strlen(err), err);
	sprintf(str,"\r\nOriginal message text follows:\r\n");
	smb_hfield(&newmsg, SMTPSYSMSG, (ushort)strlen(str), str);

	if((i=smb_addmsghdr(smb,&newmsg,SMB_SELFPACK))!=0)
		lprintf("0000 !BOUNCE ERROR %d (%s) adding message header"
			,i,smb->last_error);
	else {
		if((i=smb_incmsg(smb,&newmsg))!=0)
			lprintf("0000 !BOUNCE ERROR %d (%s) incrementing data allocation units"
				,i,smb->last_error);
	}

	newmsg.dfield=NULL;				/* Don't double-free the data fields */
	newmsg.hdr.total_dfields=0;
	smb_freemsgmem(&newmsg);

	return(TRUE);
}

#ifdef __BORLANDC__
#pragma argsused
#endif
static void sendmail_thread(void* arg)
{
	int			i,j;
	char		to[128];
	char		mx[128];
	char		mx2[128];
	char		err[128];
	char		buf[512];
	char		toaddr[256];
	char		fromaddr[256];
	char*		server;
	char*		msgtxt=NULL;
	char*		p;
	ushort		port;
	ulong		offset;
	ulong		last_msg=0;
	ulong		total_msgs;
	ulong		ip_addr;
	ulong		dns;
	ulong		lines;
	BOOL		success;
	SOCKET		sock=INVALID_SOCKET;
	SOCKADDR_IN	addr;
	SOCKADDR_IN	server_addr;
	time_t		last_scan=0;
	smb_t		smb;
	smbmsg_t	msg;

	sendmail_running=TRUE;

	thread_up(TRUE /* setuid */);

	lprintf("0000 SendMail thread started");

	memset(&msg,0,sizeof(msg));
	memset(&smb,0,sizeof(smb));

	while(server_socket!=INVALID_SOCKET) {

		if(startup->options&MAIL_OPT_NO_SENDMAIL) {
			mswait(1000);
			continue;
		}

		if(active_sendmail!=0) {
			active_sendmail=0;
			update_clients();
		}

		smb_close(&smb);

		if(sock!=INVALID_SOCKET) {
			mail_close_socket(sock);
			sock=INVALID_SOCKET;
		}

		if(msgtxt!=NULL) {
			smb_freemsgtxt(msgtxt);
			msgtxt=NULL;
		}

		smb_freemsgmem(&msg);

		mswait(3000);

		sprintf(smb.file,"%smail",scfg.data_dir);
		smb.retry_time=scfg.smb_retry_time;
		smb.subnum=INVALID_SUB;
		if((i=smb_open(&smb))!=0) 
			continue;
		if((i=smb_locksmbhdr(&smb))!=0)
			continue;
		i=smb_getstatus(&smb);
		smb_unlocksmbhdr(&smb);
		if(i!=0)
			continue;
		if(smb.status.last_msg==last_msg && time(NULL)-last_scan<startup->rescan_frequency)
			continue;
		last_msg=smb.status.last_msg;
		last_scan=time(NULL);
		total_msgs=smb.status.total_msgs;
		smb_rewind(smb.sid_fp);
		for(offset=0;offset<total_msgs;offset++) {

			if(active_sendmail!=0) {
				active_sendmail=0;
				update_clients();
			}

			if(server_socket==INVALID_SOCKET)	/* server stopped */
				break;

			if(sock!=INVALID_SOCKET) {
				mail_close_socket(sock);
				sock=INVALID_SOCKET;
			}

			if(msgtxt!=NULL) {
				smb_freemsgtxt(msgtxt);
				msgtxt=NULL;
			}

			smb_freemsgmem(&msg);

			smb_fseek(smb.sid_fp, offset*sizeof(msg.idx), SEEK_SET);
			if(smb_fread(&msg.idx, sizeof(msg.idx), smb.sid_fp) != sizeof(msg.idx))
				break;
			if(msg.idx.attr&MSG_DELETE)	/* Marked for deletion */
				continue;
			if(msg.idx.to)	/* Local */
				continue;
			msg.offset=offset;

			if((i=smb_lockmsghdr(&smb,&msg))!=0) {
				lprintf("0000 !SEND ERROR %d (%s) locking message header #%lu"
					,i, smb.last_error, msg.idx.number);
				continue;
			}
			i=smb_getmsghdr(&smb,&msg);
			smb_unlockmsghdr(&smb,&msg);
			if(i!=0) {
				lprintf("0000 !SEND ERROR %d (%s) reading message header #%lu"
					,i, smb.last_error, msg.idx.number);
				continue; 
			}

			if(msg.to_net.type!=NET_INTERNET || msg.to_net.addr==NULL) 
				continue;

			active_sendmail=1;
			update_clients();

			lprintf("0000 SEND Message #%lu from %s to %s"
				,msg.hdr.number, msg.from, msg.to_net.addr);
			status("Sending");
#ifdef _WIN32
			if(startup->outbound_sound[0] && !(startup->options&MAIL_OPT_MUTE)) 
				PlaySound(startup->outbound_sound, NULL, SND_ASYNC|SND_FILENAME);
#endif

			lprintf("0000 SEND getting message text");
			if((msgtxt=smb_getmsgtxt(&smb,&msg,GETMSGTXT_TAILS))==NULL) {
				lprintf("0000 !SEND ERROR (%s) retrieving message text",smb.last_error);
				continue;
			}

			port=0;
			if(startup->options&MAIL_OPT_RELAY_TX) { 
				server=startup->relay_server;
				port=startup->relay_port;
			} else {
				p=strrchr((char*)msg.to_net.addr,':');	/* non-standard SMTP port */
				if(p!=NULL) {
					*p=0;
					port=atoi(p+1);
				}
				SAFECOPY(to,(char*)msg.to_net.addr);
				truncstr(to,"> ");

				p=strrchr(to,'@');
				if(p==NULL) {
					lprintf("0000 !SEND INVALID destination address: %s", to);
					sprintf(err,"Invalid destination address: %s", to);
					bounce(&smb,&msg,err,TRUE);
					continue;
				}
				if((dns=resolve_ip(startup->dns_server))==0) {
					lprintf("0000 !SEND INVALID DNS server address: %s"
						,startup->dns_server);
					continue;
				}
				p++;
				lprintf("0000 SEND getting MX records for %s from %s",p,startup->dns_server);
				if((i=dns_getmx(p, mx, mx2, startup->interface_addr, dns
					,startup->options&MAIL_OPT_USE_TCP_DNS ? TRUE : FALSE
					,TIMEOUT_THREAD_WAIT/2))!=0) {
					lprintf("0000 !SEND ERROR %d obtaining MX records for %s from %s"
						,i,p,startup->dns_server);
					sprintf(err,"Error %d obtaining MX record for %s",i,p);
					bounce(&smb,&msg,err,FALSE);
					continue;
				}
				server=mx;
			}
			if(!port)
				port=IPPORT_SMTP;


			if((sock=mail_open_socket(SOCK_STREAM))==INVALID_SOCKET) {
				lprintf("0000 !SEND ERROR %d opening socket", ERROR_VALUE);
				continue;
			}

			memset(&addr,0,sizeof(addr));
			addr.sin_addr.s_addr = htonl(startup->interface_addr);
			addr.sin_family = AF_INET;

			if(startup->seteuid!=NULL)
				startup->seteuid(FALSE);
			i=bind(sock,(struct sockaddr *)&addr, sizeof(addr));
			if(startup->seteuid!=NULL)
				startup->seteuid(TRUE);
			if(i!=0) {
				lprintf("%04d !SEND ERROR %d (%d) binding socket", sock, i, ERROR_VALUE);
				continue;
			}

			strcpy(err,"UNKNOWN ERROR");
			success=FALSE;
			for(j=0;j<2 && !success;j++) {
				if(j) {
					if(startup->options&MAIL_OPT_RELAY_TX || !mx2[0])
						break;
					server=mx2;	/* Give second mx record a try */
				}
				
				lprintf("%04d SEND resolving SMTP hostname: %s", sock, server);
				ip_addr=resolve_ip(server);
				if(!ip_addr)  {
					sprintf(err,"Failed to resolve SMTP hostname: %s",server);
					continue;
				}

				memset(&server_addr,0,sizeof(server_addr));
				server_addr.sin_addr.s_addr = ip_addr;
				server_addr.sin_family = AF_INET;
				server_addr.sin_port = htons(port);
				
				lprintf("%04d SEND connecting to port %u on %s [%s]"
					,sock
					,ntohs(server_addr.sin_port)
					,server,inet_ntoa(server_addr.sin_addr));
				if((i=connect(sock, (struct sockaddr *)&server_addr, sizeof(server_addr)))!=0) {
					i=ERROR_VALUE;
					lprintf("%04d !SEND ERROR %d connecting to SMTP server: %s"
						,sock
						,i, server);
					sprintf(err,"Error %d connecting to SMTP server: %s"
						,i, server);
					continue;
				}
				success=TRUE;
			}
			if(!success) {	/* Failed to send, so bounce */
				bounce(&smb,&msg,err,FALSE);	
				continue;
			}

			lprintf("%04d SEND connected to %s",sock,server);

			/* HELO */
			if(!sockgetrsp(sock,"220",buf,sizeof(buf))) {
				sprintf(err,badrsp_err,server,buf,"220");
				bounce(&smb,&msg,err,buf[0]=='5');
				continue;
			}
			sockprintf(sock,"HELO %s",startup->host_name);
			if(!sockgetrsp(sock,"250", buf, sizeof(buf))) {
				sprintf(err,badrsp_err,server,buf,"250");
				bounce(&smb,&msg,err,buf[0]=='5');
				continue;
			}
			/* MAIL */
			if(msg.from_net.type==NET_INTERNET && msg.reverse_path!=NULL)
				SAFECOPY(fromaddr,msg.reverse_path);
			else 
				usermailaddr(&scfg,fromaddr,msg.from);
			truncstr(fromaddr," ");
			if(fromaddr[0]=='<')
				sockprintf(sock,"MAIL FROM: %s",fromaddr);
			else
				sockprintf(sock,"MAIL FROM: <%s>",fromaddr);
			if(!sockgetrsp(sock,"250", buf, sizeof(buf))) {
				sprintf(err,badrsp_err,server,buf,"250");
				bounce(&smb,&msg,err,buf[0]=='5');
				continue;
			}
			/* RCPT */
			if((p=strrchr((char*)msg.to_net.addr,'<'))!=NULL)
				p++;
			else
				p=(char*)msg.to_net.addr;
			SAFECOPY(toaddr,p);
			truncstr(toaddr,"> ");
			sockprintf(sock,"RCPT TO: <%s>", toaddr);
			if(!sockgetrsp(sock,"25", buf, sizeof(buf))) {
				sprintf(err,badrsp_err,server,buf,"25*");
				bounce(&smb,&msg,err,buf[0]=='5');
				continue;
			}
			/* DATA */
			sockprintf(sock,"DATA");
			if(!sockgetrsp(sock,"354", buf, sizeof(buf))) {
				sprintf(err,badrsp_err,server,buf,"354");
				bounce(&smb,&msg,err,buf[0]=='5');
				continue;
			}
			lprintf("%04d SEND sending message text (%u bytes)"
				,sock, strlen(msgtxt));
			lines=sockmsgtxt(sock,&msg,msgtxt,-1);
			if(!sockgetrsp(sock,"250", buf, sizeof(buf))) {
				sprintf(err,badrsp_err,server,buf,"250");
				bounce(&smb,&msg,err,buf[0]=='5');
				continue;
			}
			lprintf("%04d SEND message transfer complete (%lu lines)", sock, lines);

			msg.hdr.attr|=MSG_DELETE;
			msg.idx.attr=msg.hdr.attr;
			if((i=smb_lockmsghdr(&smb,&msg))!=0) 
				lprintf("%04d !SEND ERROR %d (%s) locking message header #%lu"
					,sock
					,i, smb.last_error, msg.hdr.number);
			if((i=smb_putmsg(&smb,&msg))!=0)
				lprintf("%04d !SEND ERROR %d (%s) deleting message #%lu"
					,sock
					,i, smb.last_error, msg.hdr.number);
			if(msg.hdr.auxattr&MSG_FILEATTACH)
				delfattach(&scfg,&msg);
			smb_unlockmsghdr(&smb,&msg);

			/* QUIT */
			sockprintf(sock,"QUIT");
			sockgetrsp(sock,"221", buf, sizeof(buf));
			mail_close_socket(sock);
			sock=INVALID_SOCKET;
		}				
		status(STATUS_WFC);
	}
	if(sock!=INVALID_SOCKET)
		mail_close_socket(sock);

	smb_freemsgtxt(msgtxt);
	smb_freemsgmem(&msg);
	smb_close(&smb);

	if(active_sendmail!=0) {
		active_sendmail=0;
		update_clients();
	}

	thread_down();
	lprintf("0000 SendMail thread terminated (%u threads remain)", thread_count);

	sendmail_running=FALSE;
}

void DLLCALL mail_terminate(void)
{
	recycle_server=FALSE;
	if(server_socket!=INVALID_SOCKET) {
    	lprintf("%04d MAIL Terminate: closing socket",server_socket);
		mail_close_socket(server_socket);
	    server_socket=INVALID_SOCKET;
    }
}

static void cleanup(int code)
{
	free_cfg(&scfg);

	if(server_socket!=INVALID_SOCKET) {
		mail_close_socket(server_socket);
		server_socket=INVALID_SOCKET;
	}

	if(pop3_socket!=INVALID_SOCKET) {
		mail_close_socket(pop3_socket);
		pop3_socket=INVALID_SOCKET;
	}

	update_clients();

#ifdef _WINSOCKAPI_	
	if(WSAInitialized && WSACleanup()!=0) 
		lprintf("0000 !WSACleanup ERROR %d",ERROR_VALUE);
#endif

	thread_down();
	status("Down");
    lprintf("#### Mail Server thread terminated (%u threads remain)", thread_count);
	if(startup!=NULL && startup->terminated!=NULL)
		startup->terminated(code);
}

const char* DLLCALL mail_ver(void)
{
	static char ver[256];
	char compiler[32];

	DESCRIBE_COMPILER(compiler);

	sscanf("$Revision$" + 11, "%s", revision);

	sprintf(ver,"Synchronet Mail Server %s%s  SMBLIB %s  "
		"Compiled %s %s with %s"
		,revision
#ifdef _DEBUG
		," Debug"
#else
		,""
#endif
		,smb_lib_ver()
		,__DATE__, __TIME__, compiler
		);

	return(ver);
}

void DLLCALL mail_server(void* arg)
{
	char			path[MAX_PATH+1];
	char			error[256];
	char			compiler[32];
	SOCKADDR_IN		server_addr;
	SOCKADDR_IN		client_addr;
	socklen_t		client_addr_len;
	SOCKET			client_socket;
	int				i;
	int				result;
	ulong			l;
	time_t			t;
	time_t			start;
	time_t			initialized=0;
	fd_set			socket_set;
	SOCKET			high_socket_set;
	pop3_t*			pop3;
	smtp_t*			smtp;
	struct timeval	tv;

	mail_ver();

	startup=(mail_startup_t*)arg;

    if(startup==NULL) {
    	sbbs_beep(100,500);
    	fprintf(stderr, "No startup structure passed!\n");
    	return;
    }

	if(startup->size!=sizeof(mail_startup_t)) {	/* verify size */
		sbbs_beep(100,500);
		sbbs_beep(300,500);
		sbbs_beep(100,500);
		fprintf(stderr, "Invalid startup structure!\n");
		return;
	}

	/* Setup intelligent defaults */
	if(startup->relay_port==0)				startup->relay_port=IPPORT_SMTP;
	if(startup->smtp_port==0)				startup->smtp_port=IPPORT_SMTP;
	if(startup->pop3_port==0)				startup->pop3_port=IPPORT_POP3;
	if(startup->rescan_frequency==0)		startup->rescan_frequency=3600;	/* 60 minutes */
	if(startup->max_delivery_attempts==0)	startup->max_delivery_attempts=50;
	if(startup->max_inactivity==0) 			startup->max_inactivity=120; /* seconds */
	if(startup->max_recipients==0) 			startup->max_recipients=100;

	startup->recycle_now=FALSE;
	recycle_server=TRUE;
	do {

		thread_up(FALSE /* setuid */);

		status("Initializing");

		memset(&scfg, 0, sizeof(scfg));

		lprintf("Synchronet Mail Server Revision %s%s"
			,revision
#ifdef _DEBUG
			," Debug"
#else
			,""
#endif
			);

		DESCRIBE_COMPILER(compiler);

		lprintf("Compiled %s %s with %s", __DATE__, __TIME__, compiler);

		lprintf("SMBLIB %s (format %x.%02x)",smb_lib_ver(),smb_ver()>>8,smb_ver()&0xff);

		srand(time(NULL));

		if(!winsock_startup()) {
			cleanup(1);
			return;
		}

		t=time(NULL);
		lprintf("Initializing on %.24s with options: %lx"
			,ctime(&t),startup->options);

		/* Initial configuration and load from CNF files */
		SAFECOPY(scfg.ctrl_dir,startup->ctrl_dir);
		lprintf("Loading configuration files from %s", scfg.ctrl_dir);
		scfg.size=sizeof(scfg);
		SAFECOPY(error,UNKNOWN_LOAD_ERROR);
		if(!load_cfg(&scfg, NULL, TRUE, error)) {
			lprintf("!ERROR %s",error);
			lprintf("!Failed to load configuration files");
			cleanup(1);
			return;
		}

		if(startup->host_name[0]==0)
			SAFECOPY(startup->host_name,scfg.sys_inetaddr);

		if(!(scfg.sys_misc&SM_LOCAL_TZ) && !(startup->options&MAIL_OPT_LOCAL_TIMEZONE)) {
			if(putenv("TZ=UTC0"))
				lprintf("!putenv() FAILED");
			tzset();

			if((t=checktime())!=0) {   /* Check binary time */
				lprintf("!TIME PROBLEM (%ld)",t);
				cleanup(1);
				return;
			}
		}

		if(startup->max_clients==0) {
			startup->max_clients=scfg.sys_nodes;
			if(startup->max_clients<10)
				startup->max_clients=10;
		}

		lprintf("Maximum clients: %u",startup->max_clients);

		lprintf("Maximum inactivity: %u seconds",startup->max_inactivity);

		active_clients=0;
		update_clients();

		/* open a socket and wait for a client */

		server_socket = mail_open_socket(SOCK_STREAM);

		if(server_socket == INVALID_SOCKET) {
			lprintf("!ERROR %d opening socket", ERROR_VALUE);
			cleanup(1);
			return;
		}