diff --git a/src/smtp.c b/src/smtp.c
index 2f50553..2a41e3b 100644
--- a/src/smtp.c
+++ b/src/smtp.c
@@ -276,7 +276,7 @@
 
    session->fd = -1;
 
-   syslog(LOG_PRIORITY, "received: %s, from=%s, size=%d, client=%s", session->ttmpfile, session->mailfrom, session->tot_len, session->remote_host);
+   syslog(LOG_PRIORITY, "received: %s, from=%s, size=%d, client=%s, fd=%d", session->ttmpfile, session->mailfrom, session->tot_len, session->remote_host, session->net.socket);
 
    move_email(session);