[Mailman-Users] Odd smtp-error
Rich.West at wesmo.com
Sun Oct 24 06:41:09 CEST 2004
Mark Sapiro wrote:
>>o In the sendmail logs, I get (just do the normal replacements for the
>>words "at" and "dot"):
>>Oct 23 21:26:08 cranium sm-mta: i9O1Q8EF013718:
>>from=<test-bounces+rich dot west=wesmo dot com at lists dot wesmo dot com>,
>>size=1421, class=0, nrcpts=0, proto=ESMTP, daemon=MTA, relay=localhost
>The above envelope from is VERP like.
>><..snip..> Weird.. I never had to alter [the value of SMTP_MAX_SESSIONS_PER_CONNECTION] before... Will that have a
>>negative impact on things in any way?!
>Yes, but not too much. The VERP like address above is used for enhanced
>bounce detection and is controlled by VERP_DELIVERY_INTERVAL and other
I went through the Defaults.py file and read up on VERP to get better
>This is the big performance hit with VERP like envelope from because
>the message text must be repeated for each recipient as opposed to
>non-personalized, non-VERP which may have just one MAIL FROM:, a bunch
>of RCPT TO: and one DATA.
>In your case, setting SMTP_MAX_SESSIONS_PER_CONNECTION = 1 takes the
>above SMTP session with multiple transactions and puts QUIT, get
>disconnected, reconnect, EHLO between each message. This adds some
>impact, but not alot compared to the impact of doing the VERP like
>addressing at all.<..snip..>
>It seems like there is some problem with your MTA accepting multiple
>transactions per session or possibly with the way Mailman sends them.
Possibly.. I went looking through my mm_cfg.py and, at the end, the
following VERP options had been enabled:
VERP_PASSWORD_REMINDERS = 1
VERP_PERSONALIZED_DELIVERIES = 1
VERP_DELIVERY_INTERVAL = 1
VERP_CONFIRMATIONS = 1
Basically, everything was turned on. For sanity sake with regards to
the testing, I set the value for SMTP_MAX_SESSIONS_PER_CONNECTION back
to 0 in the Defaults.py file (since I really should have set it in
mm_cfg.py anyhow), commented out the above values in the mm_cfg.py,
recompiled, restarted mailman, and shot off a test email.
It came through with no problems.
So, I guess it is a toss up as to having VERP enabled with one SMTP
connection per transaction or disabling VERP and setting the SMTP max
sessions per connection to 0 (unlimited)...
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