I'm not sure if this is a Postfix question or a Mailman question.

I'm running Postfix-2, amavisd-new-20021227 and Mailman. I just upgraded
Mailman from v2.0.12 to v2.1, and the operation seems to have changed,
causing a significant hit on performance.

When a message is sent from a list member to the Mailman list on the
server, it is scanned by Amavis and sent to the list server for
distribution. Then Mailman creates a separate message for each recipient,
with a from=<address being of the format
from=<listname-bounces+username=userdomain.comlisthost.com> and the
to=<listmemberemail.addr

Each of these messages are then sent back to Amavis for scanning and then
sent to the list member. Even though the original message was scanned when
it was received by the server, each outgoing message is scanned prior to
being distributed to the list. For a large list, like one with 1,200
members, this is a significant overhead.

It seems that when we were running Mailman 2.0.12, the message was scanned
when it was received, but it was not scanned again when being distributed
to the list of members.

Is there any setting changes I can make, perhaps in master,cf, to eliminate
the second scan of the message prior to distributing it via Mailman, while
ensuring it has been scanned on the original receipt.

Thanks!

Larry

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