Postfix XVERP support for SMTPDirect.py

[tzs]

This patch adds support for Postfix's XVERP ESMTP
extension for doing VERP on delivery instead of
requiring Mailman to inject the message once per
recipient when VERPing.

This patch is against Mailman 2.1.2

To make it work, add:

VERP_STYLE = 'Postfix'
POSTFIX_XVERP_OPTS = '+='

to mm_cfg.py And to go back to Mailman's way of doing
VERP, you can set VERP_STYLE = 'Mailman'

[tzs (tzs)]

The file mm21-postfix-verp.diff was added: XVERP patch for Mailman 2.1.2

[m-a (m-a-users)]

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I have updated the patch for 2.1.4, find it at
http://sourceforge.net/tracker/index.php?
func=detail&aid=869638&group_id=103&atid=300103

[jfesler (jfesler)]

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I for one find this a valuable contribution. It doesn't apply perfectly cleanly on the latest release of mailman but it does apply pretty easily by hand. This patch makes a big difference on system performance.

[Mark Sapiro (msapiro)]

An updated version of the patch for Mailman 2.1.14 which includes a minor refactoring due the the change in SMTPDirect for the include_sender_header option is attached.