New option to control whether the "KILLSENT" attribute is set on locally...

New option to control whether the "KILLSENT" attribute is set on locally created Internet email messages. Defaults to "No".
At the request of Mark Lewis.

src/sbbs3/scfg/scfgnet.c

@@ -659,6 +659,9 @@ void net_cfg()
 				sprintf(opt[i++],"%-27.27s%s"
 					,"Send E-mail Using Alias"
 					,cfg.inetmail_misc&NMAIL_ALIAS ? "Yes":"No");
+				sprintf(opt[i++],"%-27.27s%s"
+					,"Kill E-mail After Sent"
+					,cfg.inetmail_misc&NMAIL_KILL ? "Yes":"No");
 				sprintf(opt[i++],"%-27.27s%"PRIu32
 					,"Cost to Send E-mail",cfg.inetmail_cost);
 				opt[i][0]=0;
@@ -766,6 +769,25 @@ void net_cfg()
 						}
 						break;
 					case 6:
+						i=0;q
+						uifc.helpbuf=
+							"`Kill Internet E-mail After it is Sent:`\n"
+							"\n"
+							"If you want Internet E-mail messages to be deleted after they are\n"
+							"successfully sent, set this option to `Yes`.\n"
+						;
+						i=uifc.list(WIN_MID|WIN_SAV,0,0,0,&i,0
+							,"Kill Internet E-mail After it is Sent",uifcYesNoOpts);
+						if(!i && !(cfg.inetmail_misc&NMAIL_KILL)) {
+							uifc.changes=1;
+							cfg.inetmail_misc|=NMAIL_KILL; 
+						}
+						else if(i==1 && cfg.inetmail_misc&NMAIL_KILL) {
+							uifc.changes=1;
+							cfg.inetmail_misc&=~NMAIL_KILL;
+						}
+						break;
+					case 7:
 						ultoa(cfg.inetmail_cost,str,10);
 						uifc.helpbuf=
 							"`Cost in Credits to Send Internet E-mail:`\n"