Don't put UTF-8 chars in the new e-mail user notification message/telegram.

We don't yet support UTF-8 in node/user messages.

src/sbbs3/mailsrvr.c

@@ -3950,6 +3950,8 @@ static void smtp_thread(void* arg)
 								,startup->newmail_notice
 								,timestr(&scfg,newmsg.hdr.when_imported.time,tmp)
 								,sender, p);
+							if(newmsg.hdr.auxattr&MSG_HFIELDS_UTF8)
+								utf8_to_cp437_str(str);
 							if(!newmsg.idx.to) 	/* Forwarding */
 								sprintf(str+strlen(str), startup->forward_notice, rcpt_addr);
 							putsmsg(&scfg, usernum, str);