diff -urN mutt-1.4.1.org/configure.in mutt-1.4.1/configure.in
--- mutt-1.4.1.org/configure.in	2003-08-21 15:30:19.000000000 +0200
+++ mutt-1.4.1/configure.in	2003-08-21 15:31:08.962016232 +0200
@@ -869,6 +869,19 @@
   AC_DEFINE(HAVE_LANGINFO_YESEXPR,1,[ Define if you have <langinfo.h> and nl_langinfo(YESEXPR). ])
 fi
 
+dnl -- libesmtp --
+MUTT_AM_LIBESMTP
+if test x$use_libesmtp = xyes; then
+    CFLAGS="$CFLAGS $mutt_libesmtp_cflags"
+    MUTTLIBS="$MUTTLIBS $mutt_libesmtp_libs"
+    MUTT_LIB_OBJECTS="$MUTT_LIB_OBJECTS mutt_libesmtp.o -lpthread"
+
+    AC_DEFINE(USE_LIBESMTP,
+              1,
+	      [Define to enable the use of libesmtp])
+fi
+dnl -- end libesmtp --
+
 AC_OUTPUT(Makefile intl/Makefile m4/Makefile
         po/Makefile.in doc/Makefile contrib/Makefile
         muttbug.sh
diff -urN mutt-1.4.1.org/globals.h mutt-1.4.1/globals.h
--- mutt-1.4.1.org/globals.h	2003-08-21 15:30:19.000000000 +0200
+++ mutt-1.4.1/globals.h	2003-08-21 15:31:08.964015928 +0200
@@ -103,6 +103,12 @@
 WHERE char *Signature;
 WHERE char *SigDirectory;
 WHERE char *SimpleSearch;
+#if defined(USE_LIBESMTP)
+WHERE char *SmtpAuthUser;
+WHERE char *SmtpAuthPass;
+WHERE char *SmtpHost;
+WHERE unsigned short SmtpPort;
+#endif
 WHERE char *Spoolfile;
 #if defined(USE_SSL) || defined(USE_NSS)
 WHERE char *SslCertFile INITVAL (NULL);
diff -urN mutt-1.4.1.org/init.h mutt-1.4.1/init.h
--- mutt-1.4.1.org/init.h	2003-08-21 15:30:19.000000000 +0200
+++ mutt-1.4.1/init.h	2003-08-21 15:31:08.976014104 +0200
@@ -99,6 +99,9 @@
 # ifndef USE_SOCKET
 #  define USE_SOCKET
 # endif
+# ifndef USE_LIBESMTP
+#  define USE_LIBESMTP
+# endif
 #endif
 
 struct option_t MuttVars[] = {
@@ -1468,6 +1471,38 @@
   /*
   */
 #endif /* HAVE_PGP */
+ 
+#if defined(USE_LIBESMTP)
+  { "smtp_auth_username", DT_STR, R_NONE, UL &SmtpAuthUser, 0 },
+  /*
+   ** .pp
+   ** Defines the username to use with SMTP AUTH.  Setting this variable will
+   ** cause mutt to attempt to use SMTP AUTH when sending.
+   */
+   { "smtp_auth_password", DT_STR, R_NONE, UL &SmtpAuthPass, 0 },
+   /*
+   ** .pp
+   ** Defines the password to use with SMTP AUTH.  If ``$$smtp_auth_username''
+   ** is set, but this variable is not, you will be prompted for a password
+   ** when sending.
+   */
+   { "smtp_host", DT_STR, R_NONE, UL &SmtpHost, 0 },
+   /*
+   ** .pp
+   ** Defines the SMTP host which will be used to deliver mail, as opposed
+   ** to invoking the sendmail binary.  Setting this variable overrides the
+   ** value of ``$$sendmail'', and any associated variables.
+   */
+   { "smtp_port", DT_NUM, R_NONE, UL &SmtpPort, 25 },
+   /*
+   ** .pp
+   ** Defines the port that the SMTP host is listening on for mail delivery.
+   ** Must be specified as a number.
+   ** .pp
+   ** Defaults to 25, the standard SMTP port, but RFC 2476-compliant SMTP
+   ** servers will probably desire 587, the mail submission port.
+   */
+#endif
   
 #if defined(USE_SSL)||defined(USE_NSS)
 # ifndef USE_NSS  
diff -urN mutt-1.4.1.org/m4/libesmtp.m4 mutt-1.4.1/m4/libesmtp.m4
--- mutt-1.4.1.org/m4/libesmtp.m4	1970-01-01 01:00:00.000000000 +0100
+++ mutt-1.4.1/m4/libesmtp.m4	2003-08-21 15:31:08.978013800 +0200
@@ -0,0 +1,60 @@
+dnl vim:ft=config:
+
+dnl Search for libesmtp, by Steven Engelhardt <sengelha@yahoo.com>
+dnl
+dnl libesmtp often requires linking against -lpthread or -lc_r (BSD).
+dnl This macro attempts to centralize this code.
+
+AC_DEFUN([MUTT_AM_LIBESMTP],
+[
+  AC_ARG_WITH(
+    [libesmtp],
+    [  --with-libesmtp=DIR      Compile in support for libesmtp for the MTA],
+    [ if test "$with_libesmtp" != "no"
+      then
+        mutt_libesmtp_check_path="$PATH"
+
+        if test "$with_libesmtp" != "yes"
+        then
+          mutt_libesmtp_check_path="$tmp_path:$withval/bin"
+        fi
+
+        dnl 1. Find libesmtp-config
+        mutt_libesmtp_config_path=`which libesmtp-config || echo no`
+
+        if test "$mutt_libesmtp_config_path" = "no"
+        then
+          AC_MSG_ERROR([libesmtp-config binary not found.])
+        fi
+
+        dnl 2. Get CFLAGS and LIBS from libesmtp-config
+        mutt_libesmtp_cflags=`$mutt_libesmtp_config_path --cflags`
+        mutt_libesmtp_libs=`$mutt_libesmtp_config_path --libs`
+
+        dnl 3. Verify libesmtp.h can be found with these settings
+        temp_CFLAGS="$CFLAGS"
+        CFLAGS="$CFLAGS $mutt_libesmtp_cflags"
+        AC_CHECK_HEADER([libesmtp.h],
+                        [],
+                        AC_MSG_ERROR([Could not find libesmtp.h]))
+        CFLAGS="$temp_CFLAGS"
+
+        dnl 4. Verify the libesmtp library can be linked in
+        temp_CFLAGS="$CFLAGS"
+        temp_LIBS="$LIBS"
+        CFLAGS="$CFLAGS $mutt_libesmtp_cflags"
+        LIBS="$LIBS $mutt_libesmtp_libs"
+        AC_CHECK_LIB([esmtp],
+                     [smtp_create_session],
+                     [],
+                     AC_MSG_ERROR([Could not find libesmtp]))
+        CFLAGS="$temp_CFLAGS"
+        LIBS="$temp_LIBS"
+
+        dnl 5. Export use_libesmtp variable so configure.in can
+        dnl    act accordingly.
+        use_libesmtp=yes
+      fi
+    ]
+  )
+])
diff -urN mutt-1.4.1.org/main.c mutt-1.4.1/main.c
--- mutt-1.4.1.org/main.c	2003-08-21 15:30:19.000000000 +0200
+++ mutt-1.4.1/main.c	2003-08-21 15:31:08.982013192 +0200
@@ -226,6 +226,12 @@
 #else
 	"-USE_SASL  "
 #endif
+
+#ifdef USE_LIBESMTP
+    "+USE_LIBESMTP  "
+#else
+    "-USE_LIBESMTP  "
+#endif
 	"\n"
 	
 #ifdef HAVE_REGCOMP
diff -urN mutt-1.4.1.org/Makefile.am mutt-1.4.1/Makefile.am
--- mutt-1.4.1.org/Makefile.am	2003-08-21 15:30:18.000000000 +0200
+++ mutt-1.4.1/Makefile.am	2003-08-21 15:31:08.984012888 +0200
@@ -68,7 +68,8 @@
 EXTRA_mutt_SOURCES = account.c md5c.c mutt_sasl.c mutt_socket.c mutt_ssl.c \
 	mutt_tunnel.c pop.c pop_auth.c pop_lib.c pgp.c pgpinvoke.c pgpkey.c \
 	pgplib.c sha1.c pgpmicalg.c gnupgparse.c resize.c dotlock.c remailer.c \
-	browser.h mbyte.h remailer.h url.h mutt_ssl_nss.c pgppacket.c 
+	browser.h mbyte.h remailer.h url.h mutt_ssl_nss.c pgppacket.c \
+	mutt_libesmtp.c
 
 EXTRA_DIST = COPYRIGHT GPL OPS OPS.PGP TODO configure acconfig.h account.h \
 	attach.h buffy.h charset.h compress.h copy.h dotlock.h functions.h \
@@ -80,7 +81,8 @@
 	_regex.h OPS.MIX README.SECURITY remailer.c remailer.h browser.h \
 	mbyte.h	lib.h extlib.c pgpewrap.c pgplib.h Muttrc.head Muttrc \
 	makedoc.c stamp-doc-rc README.SSL \
-	muttbug pgppacket.h depcomp ascii.h BEWARE PATCHES patchlist.sh
+	muttbug pgppacket.h depcomp ascii.h BEWARE PATCHES patchlist.sh \
+	mutt_libesmtp.h
 
 mutt_dotlock_SOURCES = mutt_dotlock.c
 mutt_dotlock_LDADD = @LIBOBJS@
diff -urN mutt-1.4.1.org/mutt_libesmtp.c mutt-1.4.1/mutt_libesmtp.c
--- mutt-1.4.1.org/mutt_libesmtp.c	1970-01-01 01:00:00.000000000 +0100
+++ mutt-1.4.1/mutt_libesmtp.c	2003-08-21 15:31:08.987012432 +0200
@@ -0,0 +1,224 @@
+#include "mutt.h"
+#include <auth-client.h>
+#include <libesmtp.h>
+#include <errno.h>
+
+static char authpass[STRING] = "";
+
+#define FAIL() \
+  do { \
+    ret = -1; \
+    goto Done; \
+  } while (0)
+#define MSGFAIL(msg) \
+  do { \
+    mutt_error("%s", msg); \
+    FAIL(); \
+  } while (0)
+#define LIBCFAIL(msg) \
+  do { \
+    mutt_error("%s: %s", msg, strerror(errno)); \
+    FAIL(); \
+  } while (0)
+#define SMTPFAIL(msg) \
+  do { \
+    _mutt_libesmtp_perror(msg); \
+    FAIL(); \
+  } while (0)
+
+/*
+ * _mutt_libesmtp_ensure_init
+ *   Make sure the libESMTP support in mutt is initialized at some time.
+ */
+static void
+_mutt_libesmtp_ensure_init()
+{
+  static int libesmtp_init = 0;
+
+  if (!libesmtp_init) {
+    if (SmtpAuthUser)
+      auth_client_init();
+    libesmtp_init = 1;
+  }
+}
+
+/*
+ * _mutt_libesmtp_perror
+ *   Prints 'msg', a colon, and then a string representation of the
+ *   libesmtp errno as a mutt error.
+ */
+static void
+_mutt_libesmtp_perror(const char* msg)
+{
+  char buf[512];
+
+  mutt_error("%s: %s", msg, smtp_strerror(smtp_errno(), buf, sizeof(buf)));
+}
+
+/*
+ * _mutt_libesmtp_add_recipients
+ *   Adds every address in 'addr' as a recipient to the smtp message
+ *   'message'.  Note that this does not mean that they will necessarily
+ *   show up in the mail headers (e.g., when bcc'ing).  Returns 0 upon
+ *   success, -1 upon failure (and prints an error message).
+ *
+ *   Very similar to sendlib.c::add_args
+ */
+static int
+_mutt_libesmtp_add_recipients(smtp_message_t message, ADDRESS *addr)
+{
+  int ret = 0;
+
+  for (; addr; addr = addr->next) {
+    /* weed out group mailboxes, since those are for display only */
+    if (addr->mailbox && !addr->group) {
+      if (!smtp_add_recipient(message, addr->mailbox))
+        SMTPFAIL("smtp_add_recipient");
+    }
+  }
+
+Done:
+  return ret;
+}
+
+static int
+_mutt_libesmtp_auth_interact(auth_client_request_t request,
+                             char **result, int fields, void *arg)
+{
+  int i;
+
+  for (i = 0; i < fields; i++) {
+    if (request[i].flags & AUTH_USER) {
+      result[i] = SmtpAuthUser;
+    } else if (request[i].flags & AUTH_PASS) {
+      if (SmtpAuthPass) {
+        result[i] = SmtpAuthPass;
+      } else {
+        if (authpass[0] == '\0') {
+          char prompt[STRING];
+
+          snprintf(prompt, sizeof(prompt), "%s%s: ", request[i].prompt,
+                   (request[i].flags & AUTH_CLEARTEXT) ? " (not encrypted)" : "");
+          mutt_get_password(prompt, authpass, sizeof(authpass));
+        }
+        result[i] = authpass;
+      }
+    }
+  }
+
+  return 1;
+}
+
+#define BUFLEN 8192
+
+static const char*
+_mutt_libesmtp_messagefp_cb(void **buf, int *len, void *arg)
+{
+  int octets;
+
+  if (*buf == NULL)
+    *buf = malloc(BUFLEN);
+
+  if (len == NULL) {
+    rewind((FILE*) arg);
+    return NULL;
+  }
+
+  if (fgets(*buf, BUFLEN - 2, (FILE*) arg) == NULL) {
+    octets = 0;
+  } else {
+    char* p = strchr(*buf, '\0');
+
+    if (p[-1] == '\n' && p[-2] != '\r') {
+      strcpy(p - 1, "\r\n");
+      p++;
+    }
+    octets = p - (char*) *buf;
+  }
+
+  *len = octets;
+  return *buf;
+}
+
+/*
+ * mutt_invoke_libesmtp
+ *   Sends a mail message to the provided recipients using libesmtp.
+ *   Returns 0 upon success, -1 upon failure (and prints an error
+ *   message).
+ */
+int
+mutt_invoke_libesmtp(ADDRESS *from,  /* the sender */
+                     ADDRESS *to, ADDRESS *cc, ADDRESS *bcc, /* recips */
+                     const char *msg, /* file containing message */
+                     int eightbit) /* message contains 8bit chars */
+{
+  int ret = 0; /* return value, default = success */
+  smtp_session_t session;
+  smtp_message_t message;
+  char* hostportstr = NULL;
+  size_t hostportlen;
+  FILE* fp = NULL;
+  auth_context_t authctx = NULL;
+  const smtp_status_t* status;
+
+  _mutt_libesmtp_ensure_init();
+
+  if ((session = smtp_create_session()) == NULL)
+    SMTPFAIL("smtp_create_session");
+  if ((message = smtp_add_message(session)) == NULL)
+    SMTPFAIL("smtp_add_message");
+
+  /* Create hostname:port string and tell libesmtp */
+  /* len = SmtpHost len + colon + max port (65536 => 5 chars) + terminator */
+  hostportlen = strlen(SmtpHost) + 7;
+  hostportstr = safe_malloc(hostportlen);
+  snprintf(hostportstr, hostportlen, "%s:%d", SmtpHost, SmtpPort);
+  if (!smtp_set_server(session, hostportstr))
+    SMTPFAIL("smtp_set_server");
+
+  if (SmtpAuthUser) {
+    if ((authctx = auth_create_context()) == NULL)
+      MSGFAIL("auth_create_context failed");
+    auth_set_mechanism_flags(authctx, AUTH_PLUGIN_PLAIN, 0);
+    auth_set_interact_cb(authctx, _mutt_libesmtp_auth_interact, NULL);
+ 
+    if (!smtp_auth_set_context(session, authctx))
+      SMTPFAIL("smtp_auth_set_context");
+  }
+  
+  if ((fp = fopen(msg, "r")) == NULL)
+    LIBCFAIL("fopen");
+  if (!smtp_set_messagecb(message, _mutt_libesmtp_messagefp_cb, fp))
+    SMTPFAIL("smtp_set_messagecb");
+  if (_mutt_libesmtp_add_recipients(message, to))
+    FAIL(); 
+  if (_mutt_libesmtp_add_recipients(message, cc))
+    FAIL();
+  if (_mutt_libesmtp_add_recipients(message, bcc))
+    FAIL();
+  if (!smtp_start_session(session))
+    SMTPFAIL("smtp_start_session");
+
+  status = smtp_message_transfer_status(message);
+  if (status->code < 200 || status->code > 299) {
+    char buf[256];
+    snprintf(buf, sizeof(buf), "SMTP error while sending: %d %s", status->code, status->text);
+    MSGFAIL(buf);
+  }
+
+Done:
+  if (fp != NULL)
+    fclose(fp);
+  if (hostportstr != NULL)
+    free(hostportstr);
+  if (session != NULL)
+    smtp_destroy_session(session);
+  if (authctx != NULL)
+    auth_destroy_context(authctx);
+
+  /* Forget user-entered SMTP AUTH password if send fails */
+  if (ret != 0)
+    authpass[0] = '\0'; 
+
+  return ret;
+}
diff -urN mutt-1.4.1.org/mutt_libesmtp.h mutt-1.4.1/mutt_libesmtp.h
--- mutt-1.4.1.org/mutt_libesmtp.h	1970-01-01 01:00:00.000000000 +0100
+++ mutt-1.4.1/mutt_libesmtp.h	2003-08-21 15:31:08.988012280 +0200
@@ -0,0 +1,10 @@
+#if !defined(LIBESMTP_H)
+#define LIBESMTP_H
+
+int
+mutt_invoke_libesmtp (ADDRESS *from,	/* the sender */
+		 ADDRESS *to, ADDRESS *cc, ADDRESS *bcc, /* recips */
+		 const char *msg, /* file containing message */
+		 int eightbit); /* message contains 8bit chars */
+
+#endif /* !defined(LIBESMTP_H) */
diff -urN mutt-1.4.1.org/Muttrc.esmtp mutt-1.4.1/Muttrc.esmtp
--- mutt-1.4.1.org/Muttrc.esmtp	1970-01-01 01:00:00.000000000 +0100
+++ mutt-1.4.1/Muttrc.esmtp	2003-08-21 14:57:35.000000000 +0200
@@ -0,0 +1,20 @@
+# enable minimalistic smtp support builtin to Mutt
+set sendmail = "builtin"        
+
+# The name or address of your SMTP server.
+set smtp_serv = "fastmail.fm"   
+
+# Your login name on the SMTP server. Mutt presents you 
+# as ``smtp_user''@``smtp_host'', unless ``envelope_from''
+# is set, this will then be the message's envelope sender.
+# Defaults to your login name on the local system.
+set smtp_user = "ulferikson"    
+
+# If set, Mutt will try to use ESMPT and ``AUTH LOGIN'' to 
+# authenticate your user.
+set smtp_pass = ""              
+
+# This variable specifies which port your SMTP server is 
+# listening on.
+set smtp_port = 25              
+
diff -urN mutt-1.4.1.org/protos.h mutt-1.4.1/protos.h
--- mutt-1.4.1.org/protos.h	2003-08-21 15:30:19.000000000 +0200
+++ mutt-1.4.1/protos.h	2003-08-21 15:31:08.991011824 +0200
@@ -276,7 +276,7 @@
 int mutt_get_postponed (CONTEXT *, HEADER *, HEADER **, char *, size_t);
 int mutt_get_tmp_attachment (BODY *);
 int mutt_index_menu (void);
-int mutt_invoke_sendmail (ADDRESS *, ADDRESS *, ADDRESS *, ADDRESS *, const char *, int);
+int mutt_invoke_mta (ADDRESS *, ADDRESS *, ADDRESS *, ADDRESS *, const char *, int);
 int mutt_is_autoview (BODY *, const char *);
 int mutt_is_mail_list (ADDRESS *);
 int mutt_is_message_type(int, const char *);
diff -urN mutt-1.4.1.org/send.c mutt-1.4.1/send.c
--- mutt-1.4.1.org/send.c	2002-01-30 23:50:59.000000000 +0100
+++ mutt-1.4.1/send.c	2003-08-21 15:31:08.996011064 +0200
@@ -974,7 +974,7 @@
     return mix_send_message (msg->chain, tempfile);
 #endif
 
-  i = mutt_invoke_sendmail (msg->env->from, msg->env->to, msg->env->cc, 
+  i = mutt_invoke_mta (msg->env->from, msg->env->to, msg->env->cc, 
 			    msg->env->bcc, tempfile, (msg->content->encoding == ENC8BIT));
   return (i);
 }
diff -urN mutt-1.4.1.org/sendlib.c mutt-1.4.1/sendlib.c
--- mutt-1.4.1.org/sendlib.c	2003-08-21 15:30:19.000000000 +0200
+++ mutt-1.4.1/sendlib.c	2003-08-21 15:31:09.003010000 +0200
@@ -119,6 +119,9 @@
 #endif /* HAVE_PGP */
 
 
+#ifdef USE_LIBESMTP
+# include "mutt_libesmtp.h"
+#endif /* USE_LIBESMTP */
 
 #define DISPOSITION(X) X==DISPATTACH?"attachment":"inline"
 
@@ -1970,7 +1973,7 @@
 }
 
 
-int
+static int
 mutt_invoke_sendmail (ADDRESS *from,	/* the sender */
 		 ADDRESS *to, ADDRESS *cc, ADDRESS *bcc, /* recips */
 		 const char *msg, /* file containing message */
@@ -2066,6 +2069,20 @@
   return (i);
 }
 
+int
+mutt_invoke_mta (ADDRESS *from,	/* the sender */
+		 ADDRESS *to, ADDRESS *cc, ADDRESS *bcc, /* recips */
+		 const char *msg, /* file containing message */
+		 int eightbit) /* message contains 8bit chars */
+{
+#ifdef USE_LIBESMTP
+  if (SmtpHost)
+    return mutt_invoke_libesmtp(from, to, cc, bcc, msg, eightbit);
+#endif
+  
+  return mutt_invoke_sendmail(from, to, cc, bcc, msg, eightbit);
+}
+
 /* appends string 'b' to string 'a', and returns the pointer to the new
    string. */
 char *mutt_append_string (char *a, const char *b)
@@ -2219,8 +2236,8 @@
     mutt_copy_bytes (fp, f, h->content->length);
     fclose (f);
 
-    mutt_invoke_sendmail (env_from, to, NULL, NULL, tempfile,
-			  h->content->encoding == ENC8BIT);
+    mutt_invoke_mta (env_from, to, NULL, NULL, tempfile,
+          h->content->encoding == ENC8BIT);
   }
 
   if (msg)