Patch to mini_sendmail:
  - adds logging to syslog (facility LOG_MAIL)
  - adds logging of message info (from,to,size)
  - adds ability to send mail... ;)

--- mini_sendmail.c.orig	Wed Jun 29 20:37:15 2005
+++ mini_sendmail.c	Fri Aug 19 12:46:44 2005
@@ -34,6 +34,8 @@
 #define DO_GETPWUID	/* whether to try a getpwuid() if getlogin() fails */
 #define DO_MINUS_SP	/* whether to implement the -s and -p flags */
 #define DO_DNS		/* whether to do a name lookup on -s, or just IP# */
+#define DO_SYSLOG       /* log to syslog */
+#define DO_LOG_INFO     /* log (to syslog) message info */
 
 
 #include <unistd.h>
@@ -45,6 +47,9 @@
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <netdb.h>
+#ifdef DO_SYSLOG
+#include <syslog.h>
+#endif /* DO_SYSLOG */
 
 #ifdef DO_RECEIVED
 #include <time.h>
@@ -74,6 +79,8 @@
 static FILE* sockrfp;
 static FILE* sockwfp;
 static int got_a_recipient;
+static char from[1000];
+static char* message;
 
 
 /* Forwards. */
@@ -97,13 +104,11 @@
 main( int argc, char** argv )
     {
     int argn;
-    char* message;
 #ifdef DO_RECEIVED
     char* received;
 #endif /* DO_RECEIVED */
     char* username;
     char hostname[500];
-    char from[1000];
     int status;
     char buf[2000];
 
@@ -152,12 +157,20 @@
 	struct passwd* pw = getpwuid( getuid() );
 	if ( pw == (struct passwd*) 0 )
 	    {
+#ifdef DO_SYSLOG
+            syslog( LOG_ERR|LOG_MAIL, "can't determine username" );
+#else /* DO_SYSLOG */
 	    (void) fprintf( stderr, "%s: can't determine username\n", argv0 );
+#endif /* DO_SYSLOG */
 	    exit( 1 );
 	    }
 	username = pw->pw_name;
 #else /* DO_GETPWUID */
+#ifdef DO_SYSLOG
+        syslog( LOG_ERR|LOG_MAIL, "can't determine username" );
+#else /* DO_SYSLOG */
 	(void) fprintf( stderr, "%s: can't determine username\n", argv0 );
+#endif /* DO_SYSLOG */
 	exit( 1 );
 #endif /* DO_GETPWUID */
 	}
@@ -204,8 +217,12 @@
     status = read_response();
     if ( status != 220 )
 	{
+#ifdef DO_SYSLOG
+        syslog( LOG_ERR|LOG_MAIL, "unexpected initial greeting %d", status );
+#else /* DO_SYSLOG */
 	(void) fprintf(
 	    stderr,  "%s: unexpected initial greeting %d\n", argv0, status );
+#endif /* DO_SYSLOG */
 	exit( 1 );
 	}
 
@@ -214,9 +231,14 @@
     status = read_response();
     if ( status != 250 )
 	{
+#ifdef DO_SYSLOG
+        syslog( LOG_ERR|LOG_MAIL, "unexpected response %d to HELO command",
+            status );
+#else /* DO_SYSLOG */
 	(void) fprintf(
 	    stderr,  "%s: unexpected response %d to HELO command\n",
 	    argv0, status );
+#endif /* DO_SYSLOG */
 	exit( 1 );
 	}
 
@@ -225,9 +247,14 @@
     status = read_response();
     if ( status != 250 )
 	{
+#ifdef DO_SYSLOG
+        syslog( LOG_ERR|LOG_MAIL, "unexpected response %d to MAIL FROM command",
+            status );
+#else /* DO_SYSLOG */
 	(void) fprintf(
 	    stderr,  "%s: unexpected response %d to MAIL FROM command\n",
 	    argv0, status );
+#endif /* DO_SYSLOG */
 	exit( 1 );
 	}
 
@@ -238,7 +265,11 @@
 	parse_for_recipients( message );
     if ( ! got_a_recipient )
 	{
+#ifdef DO_SYSLOG
+        syslog( LOG_ERR|LOG_MAIL,  "no recipients found" );
+#else /* DO_SYSLOG */
 	(void) fprintf( stderr,  "%s: no recipients found\n", argv0 );
+#endif /* DO_SYSLOG */
 	exit( 1 );
 	}
 
@@ -246,9 +277,14 @@
     status = read_response();
     if ( status != 354 )
 	{
+#ifdef DO_SYSLOG
+        syslog( LOG_ERR|LOG_MAIL, "unexpected response %d to DATA command",
+            status );
+#else /* DO_SYSLOG */
 	(void) fprintf(
 	    stderr,  "%s: unexpected response %d to DATA command\n",
 	    argv0, status );
+#endif /* DO_SYSLOG */
 	exit( 1 );
 	}
 
@@ -260,17 +296,26 @@
     status = read_response();
     if ( status != 250 )
 	{
+#ifdef DO_SYSLOG
+        syslog( LOG_ERR|LOG_MAIL, "unexpected response %d to DATA", status );
+#else /* DO_SYSLOG */
 	(void) fprintf(
 	    stderr,  "%s: unexpected response %d to DATA\n", argv0, status );
+#endif /* DO_SYSLOG */
 	exit( 1 );
 	}
 
     send_command( "QUIT" );
     status = read_response();
     if ( status != 221 )
+#ifdef DO_SYSLOG
+        syslog( LOG_ERR|LOG_MAIL,
+           "unexpected response %d to QUIT command - ignored", status );
+#else /* DO_SYSLOG */
 	(void) fprintf(
 	    stderr,  "%s: unexpected response %d to QUIT command - ignored\n",
 	    argv0, status );
+#endif /* DO_SYSLOG */
 
     (void) close( sockfd1 );
     (void) close( sockfd2 );
@@ -307,7 +352,11 @@
     message = (char*) malloc( message_size );
     if ( message == (char*) 0 )
 	{
+#ifdef DO_SYSLOG
+        syslog( LOG_ERR|LOG_MAIL, "out of memory" );
+#else /* DO_SYSLOG */
 	(void) fprintf( stderr, "%s: out of memory\n", argv0 );
+#endif /* DO_SYSLOG */
 	exit( 1 );
 	}
     message_len = 0;
@@ -323,7 +372,11 @@
 	    message = (char*) realloc( (void*) message, message_size );
 	    if ( message == (char*) 0 )
 		{
+#ifdef DO_SYSLOG
+                syslog( LOG_ERR|LOG_MAIL, "out of memory" );
+#else /* DO_SYSLOG */
 		(void) fprintf( stderr, "%s: out of memory\n", argv0 );
+#endif /* DO_SYSLOG */
 		exit( 1 );
 		}
 	    }
@@ -354,7 +407,11 @@
     received = (char*) malloc( received_size );
     if ( received == (char*) 0 )
 	{
+#ifdef DO_SYSLOG
+        syslog( LOG_ERR|LOG_MAIL, "out of memory" );
+#else /* DO_SYSLOG */
 	(void) fprintf( stderr, "%s: out of memory\n", argv0 );
+#endif /* DO_SYSLOG */
 	exit( 1 );
 	}
     (void) snprintf(
@@ -533,6 +590,7 @@
     {
     char buf[1000];
     int status;
+    int stripped = 0;
 
     /* Skip leading whitespace. */
     while ( len > 0 && ( *recipient == ' ' || *recipient == '\t' ) )
@@ -546,18 +604,38 @@
 	{
 	++recipient;
 	--len;
+        stripped = 1;
 	}
-    while ( len > 0 && recipient[len-1] == '>' )
+    while ( len > 0 && recipient[len-1] == '>' && stripped == 1 )
 	--len;
 
-    (void) snprintf( buf, sizeof(buf), "RCPT TO:<%.*s>", len, recipient );
+    if (len == 0) {
+        (void) snprintf( buf, sizeof(buf), "root" );
+    } else {
+        (void) snprintf( buf, sizeof(buf), "%.*s", len, recipient );
+    }
+
+#ifdef DO_LOG_INFO
+    syslog(LOG_INFO|LOG_MAIL,"from=<%s>, to=%s, size=%d\n", from, buf, strlen(message) );
+#endif /* DO_LOG_INFO */
+
+    if (len == 0) {
+        (void) snprintf( buf, sizeof(buf), "RCPT TO:<root>" );
+    } else {
+        (void) snprintf( buf, sizeof(buf), "RCPT TO:<%.*s>", len, recipient );
+    }
     send_command( buf );
     status = read_response();
     if ( status != 250  && status != 251 )
 	{
+#ifdef DO_SYSLOG
+        syslog( LOG_ERR|LOG_MAIL, "unexpected response %d to RCPT TO command",
+            status );
+#else /* DO_SYSLOG */
 	(void) fprintf(
 	    stderr,  "%s: unexpected response %d to RCPT TO command\n",
 	    argv0, status );
+#endif /* DO_SYSLOG */
 	exit( 1 );
 	}
     got_a_recipient = 1;
@@ -618,9 +696,14 @@
 	(void) snprintf( portstr, sizeof(portstr), "%d", port );
 	if ( (gaierr = getaddrinfo( server, portstr, &hints, &ai )) != 0 )
 	    {
+#ifdef DO_SYSLOG
+            syslog( LOG_ERR|LOG_MAIL,
+                "getaddrinfo %s - %s", server, gai_strerror( gaierr ) );
+#else /* DO_SYSLOG */
 	    (void) fprintf(
 		stderr, "%s: getaddrinfo %s - %s\n", argv0, server,
 		gai_strerror( gaierr ) );
+#endif /* DO_SYSLOG */
 	    exit( 1 );
 	    }
 
@@ -647,8 +730,13 @@
 	    {
 	    if ( sizeof(sa) < aiv4->ai_addrlen )
 		{
+#ifdef DO_SYSLOG
+                syslog( LOG_ERR|LOG_MAIL,
+                    "%s - sockaddr too small (%lu < %lu)",
+#else /* DO_SYSLOG */
 		(void) fprintf(
 		    stderr, "%s - sockaddr too small (%lu < %lu)\n",
+#endif /* DO_SYSLOG */
 		    server, (unsigned long) sizeof(sa),
 		    (unsigned long) aiv4->ai_addrlen );
 		exit( 1 );
@@ -664,8 +752,13 @@
 	    {
 	    if ( sizeof(sa) < aiv6->ai_addrlen )
 		{
+#ifdef DO_SYSLOG
+                syslog( LOG_ERR|LOG_MAIL,
+                    "%s - sockaddr too small (%lu < %lu)",
+#else /* DO_SYSLOG */
 		(void) fprintf(
 		    stderr, "%s - sockaddr too small (%lu < %lu)\n",
+#endif /* DO_SYSLOG */
 		    server, (unsigned long) sizeof(sa),
 		    (unsigned long) aiv6->ai_addrlen );
 		exit( 1 );
@@ -678,15 +771,25 @@
 	    goto ok;
 	    }
 
+#ifdef DO_SYSLOG
+        syslog( LOG_ERR|LOG_MAIL,
+            "no valid address found for host %s", server );
+#else /* DO_SYSLOG */
 	(void) fprintf(
 	    stderr, "%s: no valid address found for host %s\n", argv0, server );
+#endif /* DO_SYSLOG */
 	exit( 1 );
 
 	ok:
 	freeaddrinfo( ai );
 #else /* DO_DNS */
+#ifdef DO_SYSLOG
+        syslog( LOG_ERR|LOG_MAIL,
+           "bad server IP address %s", server );
+#else /* DO_SYSLOG */
         (void) fprintf(
 	    stderr, "%s: bad server IP address %s\n", argv0, server );
+#endif /* DO_SYSLOG */
 	exit( 1 );
 #endif /* DO_DNS */
 	}
@@ -719,16 +822,27 @@
 	he = gethostbyname( server );
 	if ( he == (struct hostent*) 0 )
 	    {
+#ifdef DO_SYSLOG
+            syslog( LOG_ERR|LOG_MAIL,
+                "server name lookup of '%s' failed - %s",
+                server, hstrerror( h_errno ) );
+#else /* DO_SYSLOG */
 	    (void) fprintf(
 		stderr, "%s: server name lookup of '%s' failed - %s\n",
 		argv0, server, hstrerror( h_errno ) );
+#endif /* DO_SYSLOG */
 	    exit( 1 );
 	    }
 	sock_family = he->h_addrtype;
 	(void) memmove( &sa.sin_addr, he->h_addr, he->h_length );
 #else /* DO_DNS */
+#ifdef DO_SYSLOG
+        syslog( LOG_ERR|LOG_MAIL,
+            "bad server IP address %s", server );
+#else /* DO_SYSLOG */
 	(void) fprintf(
 	    stderr, "%s: bad server IP address %s\n", argv0, server );
+#endif /* DO_SYSLOG */
 	exit( 1 );
 #endif /* DO_DNS */
 	}
@@ -765,19 +879,32 @@
 	(void) alarm( timeout );
 	if ( fgets( buf, sizeof(buf), sockrfp ) == (char*) 0 )
 	    {
+#ifdef DO_SYSLOG
+            syslog( LOG_ERR|LOG_MAIL, "unexpected EOF" );
+#else /* DO_SYSLOG */
 	    (void) fprintf( stderr, "%s: unexpected EOF\n", argv0 );
+#endif /* DO_SYSLOG */
 	    exit( 1 );
 	    }
 	if ( verbose )
+#ifdef DO_SYSLOG
+            syslog( LOG_DEBUG|LOG_MAIL, "<<<< %s", buf );
+#else /* DO_SYSLOG */
 	    (void) fprintf( stderr, "<<<< %s", buf );
+#endif /* DO_SYSLOG */
 	for ( status = 0, cp = buf; *cp >= '0' && *cp <= '9'; ++cp )
 	    status = 10 * status + ( *cp - '0' );
 	if ( *cp == ' ' )
 	    break;
 	if ( *cp != '-' )
 	    {
+#ifdef DO_SYSLOG
+            syslog(
+                LOG_ERR|LOG_MAIL,  "bogus reply syntax - '%s'", buf );
+#else /* DO_SYSLOG */
 	    (void) fprintf(
 		stderr,  "%s: bogus reply syntax - '%s'\n", argv0, buf );
+#endif /* DO_SYSLOG */
 	    exit( 1 );
 	    }
 	}
@@ -790,7 +917,11 @@
     {
     (void) alarm( timeout );
     if ( verbose )
+#ifdef DO_SYSLOG
+        syslog( LOG_DEBUG|LOG_MAIL, ">>>> %s", command );
+#else /* DO_SYSLOG */
 	(void) fprintf( stderr, ">>>> %s\n", command );
+#endif
     (void) fprintf( sockwfp, "%s\r\n", command );
     (void) fflush( sockwfp );
     }
@@ -829,7 +960,11 @@
 static void
 sigcatch( int sig )
     {
+#ifdef DO_SYSLOG
+    syslog( LOG_ERR|LOG_MAIL, "timed out" );
+#else /* DO_SYSLOG */
     (void) fprintf( stderr, "%s: timed out\n", argv0 );
+#endif
     exit( 1 );
     }
 
@@ -840,6 +975,10 @@
     char buf[5000];
 
     (void) snprintf( buf, sizeof(buf), "%s: %s", argv0, cause );
+#ifdef DO_SYSLOG
+    syslog( LOG_ERR|LOG_MAIL, "%s", buf );
+#else /* DO_SYSLOG */
     perror( buf );
+#endif /* DO_SYSLOG */
     exit( 1 );
     }