From 5f3714fd381f715abcffc898fb09b66bab036c7f Mon Sep 17 00:00:00 2001
From: Michael Elkins <me@sigpipe.org>
Date: Fri, 25 Nov 2011 12:52:55 -0800
Subject: [PATCH] Check that $sendmail is set to avoid potential segfault. 
 Closes #3548.

---
 sendlib.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sendlib.c b/sendlib.c
index 4daafaff..1ee7fb2b 100644
--- a/sendlib.c
+++ b/sendlib.c
@@ -2344,6 +2344,13 @@ mutt_invoke_sendmail (ADDRESS *from,	/* the sender */
   size_t argslen = 0, argsmax = 0;
   int i;
 
+  /* ensure that $sendmail is set to avoid a crash. http://dev.mutt.org/trac/ticket/3548 */
+  if (!s)
+  {
+    mutt_error(_("$sendmail must be set in order to send mail."));
+    return -1;
+  }
+
   ps = s;
   i = 0;
   while ((ps = strtok (ps, " ")))
-- 
2.49.0