[Mailman-Users] Delivery to SMTP server very slow

Stefan Foerster cite+mailman-users at incertum.net
Sat Feb 20 19:27:13 CET 2010

* Mark Sapiro <mark at msapiro.net>:
> On 2/20/2010 4:21 AM, Stefan Foerster wrote:
> So, without VERP or personalization, you should be seeing SMTP
> transactions that look like
>   response
>   response
>   response
> (repeated for up to SMTP_MAX_RCPTS recipients)
>   response
> (message data)
> (MAIL FROM through DATA repeats until all recipients are delivered)

Yes. I assume you wanted me to check if there were any errors in this
dialogue - but there are none. Neither logfiles from the Python
smtplib, nor the the Postfix logs. The TCP caputure didn't show any
errors, too. And yes, I verified that there really isn't any VERP or
personalization involved (again, I read Postfix logs ("nrcpt=<large
number">) and TCP streams).

> And, if I understand what you're saying, the delay is in the RCPT
> TO/response loop and it occurs between the response and the next RCPT TO.

Yes. From debuglevel(1) logs:

Feb 20 19:03:15 2010 qrunner(7551): send:   'rcpt TO:<recipient1 at example.com>\r\n' 
Feb 20 19:03:15 2010 qrunner(7551): reply:   '250 2.1.5 Ok\r\n' 
Feb 20 19:03:15 2010 qrunner(7551): reply: retcode (250); Msg: 2.1.5 Ok 
Feb 20 19:03:17 2010 qrunner(7551): send:   'rcpt TO:<recipient2 at example.com>\r\n' 
Feb 20 19:03:17 2010 qrunner(7551): reply:   '250 2.1.5 Ok\r\n' 
Feb 20 19:03:17 2010 qrunner(7551): reply: retcode (250); Msg: 2.1.5 Ok 

If you want me to, I can gather detailed timing data with tcpdump
and/or wireshark.

> > I really don't have any idea where I coul start debugging, or how.
> Nor do I really.

Humurous remark: "That's not what you want to hear from the guy who
actually wrote the application!" ;-)

I'm running out of ideas. My Postfix smtpd(8) for mailman looks like that: inet n  -       -     -       -  smtpd
    -o mynetworks=
    -o content_filter=
    -o smtpd_proxy_filter=
    -o receive_override_options=no_header_body_checks,no_address_mappings,no_unknown_recipient_checks
    -o smtpd_client_connection_count_limit=0
    -o smtpd_client_connection_rate_limit=0
    -o smtpd_error_sleep_time=0
    -o smtpd_soft_error_limit=1001
    -o smtpd_hard_error_limit=1000
    -o smtpd_restriction_classes=
    -o smtpd_client_restrictions=
    -o smtpd_helo_restrictions=
    -o smtpd_sender_restrictions=
    -o smtpd_recipient_restrictions=permit_mynetworks,reject
    -o smtpd_data_restrictions=
    -o smtpd_end_of_data_restrictions=
    -o smtpd_authorized_xforward_hosts=
    -o syslog_name=postfix-mm

No magic involved here. My mm_cfg.py:

DEFAULT_URL_PATTERN = 'http://%s/mailman/'
PRIVATE_ARCHIVE_URL = '/mailman/private'
IMAGE_LOGOS         = '/images/mailman/'
DEFAULT_EMAIL_HOST = 'lists.example.com'
DEFAULT_URL_HOST   = 'lists.example.com'
MTA=None   # Misnomer, suppresses alias output on newlist
DEB_LISTMASTER='postmaster at example.net'
SMTPPORT = 10031

I am not able to find anything that is specific to this list, and I'm
not sure where I could look further.


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