[Mailman-Users] Patch for use of Postfix VERP support

[Fil]

Hi,

the VERP system is good to detect bounces, but it has issues when lots
of subscribers are on the same server:

(delivery temporarily suspended: connect to
smtp.xxxx.xxx.xxx[xxxxxxxxx]: Connection timed out)
(host mx01.xxxx.xxx[xxxxx] refused to talk to me: 421 4.3.2 Connection
rate limit exceeded.)

As the emails are sent one by one the connection rate to these systems
can get very high, and we get delayed.

Ideas?

-- Fil