Log message:
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.

Log message:
Interix uses WinSock, which does not provide SO_RCVTIMEO nor SO_SNDTIMEO.
Skip these options when building on Interix.

Log message:
Convert to PKG_OPTIONS_GROUP syntax.

Log message:
Only one SSL scheme can be used.  Default to (and prefer) OpenSSL; allow
fallback to gnutls of ssl is not set in OPTIONS.

Log message:
Changes 1.4.4:
- Support for the sendmail -F option (accepted but ignored).
- Removed the OpenSSL exception note from the license information.

Log message:
Changes 1.4.3:
- Automatic envelope-from addresses are only generated when auto_from is enabled
  with the new auto_from command or --auto-from option.
  This allow empty envelope from addresses to be set with the from command or
  --from option.

Log message:
Changes 1.4.2:
- The 'connect_timeout' setting was replaced by a 'timeout' setting that applies
  to all network operations. The old option and command are still accepted, but
  they are not restricted to connection attempts anymore.
- Native language support (NLS) was added. Currently the only supported language
  besides english is german, but it is easy to add more translations (hint,
  hint)!

Changes 1.4.1:
- Only bug fixes, no new features.

Log message:
Packages have no business modifying PKG_DEFAULT_OPTIONS -- it's a
user settable variable.  Set PKG_SUGGESTED_OPTIONS instead.  Also,
make use of PKG_OPTIONS_LEGACY_VARS.

Reviewed by wiz.

Log message:
Remove USE_BUILDLINK3 and NO_BUILDLINK; these are no longer used.

Log message:
Changes 1.4.0:
- This is the new stable release of msmtp.
  BEWARE: When upgrading from 1.2.4, note that
  - Authentication is not enabled automatically anymore! Insert the command
    "auth on" into account definitions that need it.
  - Some command line options have changed!
- Summary of new features since 1.2.4:
  - Sendmail compatible command line options, including -t, -N, and -R
  - New long options to configure almost everything on the command line
  - Optional account selection with -f/--from
  - Support for a system wide configuration file
  - Optional automatic construction of envelope from addresses
  - More flexible account definitions
  - Configurable connection timeouts
  - Improved log file logging
  - Syslog logging
  - Improved TLS/SSL support
  - Support for LMTP
  - Support for the EXTERNAL and GSSAPI authentication methods
  - Support for .netrc and password prompting
  - Rewritten documentation, available in various formats