diff --git a/src/sbbs3/fido.cpp b/src/sbbs3/fido.cpp
index b719f8b948311e90c6a9a0dbf3a246f4277ece08..c7893d6372e2c17bb512f59a441fa787a1557b7e 100644
--- a/src/sbbs3/fido.cpp
+++ b/src/sbbs3/fido.cpp
@@ -130,3 +130,16 @@ faddr_t atofaddr(scfg_t* cfg, char *str)
 		addr.point=atoi(p+1);
 	return(addr);
 }
+
+uint sbbs_t::sysfaddr(faddr_t dest_addr)
+{
+	uint i;
+
+	for(i=0; i<cfg.total_faddrs; i++)
+		if(dest_addr.zone == cfg.faddr[i].zone && dest_addr.net == cfg.faddr[i].net)
+			return i;
+	for(i=0; i<cfg.total_faddrs; i++)
+		if(dest_addr.zone == cfg.faddr[i].zone)
+			return i;
+	return 0;
+}
diff --git a/src/sbbs3/sbbs.h b/src/sbbs3/sbbs.h
index 08a7ed856985bcccc8ee40eb50aa8f882073054c..1087df404ed2ac30e4e1dbed86051884841caa47 100644
--- a/src/sbbs3/sbbs.h
+++ b/src/sbbs3/sbbs.h
@@ -1081,6 +1081,7 @@ public:
 
 	bool	inetmail(const char *into, const char *subj = NULL, long mode = WM_NONE, smb_t* resmb = NULL, smbmsg_t* remsg = NULL, str_list_t cc = NULL);
 	bool	qnetmail(const char *into, const char *subj = NULL, long mode = WM_NONE, smb_t* resmb = NULL, smbmsg_t* remsg = NULL);
+	uint	sysfaddr(faddr_t dest_addr);
 
 	/* useredit.cpp */
 	void	useredit(int usernumber);