The msmtp manual states that it uses the same exit codes as sendmail.

Most of these exit codes are defined in gnulib/sysexit_.h
EX_OK is defined as 0 in src/msmtp.c if it wasn't already defined.
The variable error_code is assigned these exit values, and returned at
the end of main().

On Interix, EX_OK is defined in unistd.h:
#define EX_OK           0x8001  /* test for regular executable */

patch-ab changes the logic so that when error_code == EX_OK, the exit
code is 0 instead of EX_OK.  This should work everywhere.

1 files changed, 11 insertions, 0 deletions

diff --git a/mail/msmtp/patches/patch-ab b/mail/msmtp/patches/patch-ab
new file mode 100644
index 00000000000..b59dcc9924b
--- /dev/null
+++ b/mail/msmtp/patches/patch-ab
@@ -0,0 +1,11 @@
+$NetBSD: patch-ab,v 1.1 2006/01/01 18:59:04 ben Exp $
+
+--- src/msmtp.c.orig	Sun Aug 14 13:13:02 2005
++++ src/msmtp.c
+@@ -3382,5 +3382,5 @@ exit:
+ 	list_xfree(errmsg, free);
+     }
+ 
+-    return error_code;
++    return (error_code == EX_OK) ? 0 : error_code;
+ }