If someone aborts the netuser name lookup (with Ctrl-C), don't print

"invalid netmail address"

src/sbbs3/fido.cpp

@@ -173,6 +173,7 @@ bool sbbs_t::netmail(const char *into, const char *title, long mode, smb_t* resm
 	}
 	p=strrchr(to,'@');      /* Find '@' in name@addr */
 	if(p==NULL || net_type != NET_FIDO) {
+		if(!(sys_status&SS_ABORT))
 			bputs(text[InvalidNetMailAddr]);
 		return false; 
 	}