--- BAK_ssmtp.c	2006-08-17 03:00:37.306324793 +0800
+++ ssmtp.c	2006-08-17 04:55:21.367377527 +0800
@@ -26,6 +26,7 @@
 #include <string.h>
 #include <ctype.h>
 #include <netdb.h>
+#include <errno.h>
 #ifdef HAVE_SSL
 #include <openssl/crypto.h>
 #include <openssl/x509.h>
@@ -60,6 +61,7 @@
 char *mail_domain = (char)NULL;
 char *from = (char)NULL;		/* Use this as the From: address */
 char hostname[MAXHOSTNAMELEN] = "localhost";
+char *srchost = (char)NULL;
 char *mailhost = "mailhub";
 char *minus_f = (char)NULL;
 char *minus_F = (char)NULL;
@@ -828,6 +830,15 @@
 					log_event(LOG_INFO, "Set RemotePort=\"%d\"\n", port);
 				}
 			}
+			else if(strcasecmp(p, "SrcHost") == 0) {
+				if((srchost = strdup(q)) == (char *)NULL) {
+					die("parse_config() -- strdup() failed");
+				}
+				
+				if (log_level > 0) {
+					log_event(LOG_INFO, "Set SrcHost=\"%s\"\n", srchost);
+				}
+			}
 			else if(strcasecmp(p, "HostName") == 0) {
 				if(strncpy(hostname, q, MAXHOSTNAMELEN) == NULL) {
 					die("parse_config() -- strncpy() failed");
@@ -984,8 +995,8 @@
 	char servname[NI_MAXSERV];
 	int s;
 #else
-	struct sockaddr_in name;
-	struct hostent *hent;
+	struct sockaddr_in name, srcname;
+	struct hostent *hent, *srchent;
 	int s, namelen;
 #endif
 
@@ -1080,9 +1091,29 @@
 	name.sin_family = hent->h_addrtype;
 	name.sin_port = htons(port);
 
+	/* Bind to specific source address, if provided in conf file */
+	if (srchost != (char *)NULL) {
+		if ((srchent = gethostbyname(srchost)) == (struct hostent *)NULL) {
+			log_event(LOG_ERR, "Unable to locate source host %s", srchost);
+			return(-1);
+		}
+		
+		if (srchent->h_length > sizeof(srchent->h_addr)) {
+			log_event(LOG_ERR, "Buffer overflow in gethostbyname() for source address");
+			return(-1);
+		}
+		
+		srcname.sin_addr.s_addr = ((struct in_addr *)(srchent->h_addr))->s_addr;
+		srcname.sin_family = srchent->h_addrtype;
+		if (bind(s, (struct sockaddr *)&srcname, sizeof(struct sockaddr_in)) < 0) {
+			log_event(LOG_ERR, "Unable to bind to %s (%s / %d)", srchost, strerror(errno), errno);
+			return(-1);
+		}
+	}
+
 	namelen = sizeof(struct sockaddr_in);
 	if(connect(s, (struct sockaddr *)&name, namelen) < 0) {
-		log_event(LOG_ERR, "Unable to connect to %s:%d", host, port);
+		log_event(LOG_ERR, "Unable to connect to %s:%d (%s / %d)", host, port, strerror(errno), errno);
 		return(-1);
 	}
 #endif