Lars Olson wrote:

>I’m noticing these "data format errors" in my maillog when someone
>subscribes to a list.
>
> 
>
> 
>
>Apr 24 21:54:18 www sendmail[14880]: n3P2sIXc014880:
>from=<testing-boun...@mydomain.com>, size=1602, class=0, nrcpts=1,
>msgid=<mailman.0.1240628056.14879.test...@mydomain.com>, proto=ESMTP,
>daemon=MTA, relay=mail.hostingdomain.com [127.0.0.1]
>
>Apr 24 21:54:19 www sendmail[14883]: n3P2sIXc014880:
>to=<l...@testing-domain.com>, delay=00:00:01, xdelay=00:00:01, mailer=esmtp,
>pri=121602, relay=mail.testing-domain.com. [204.112.168.252], dsn=5.6.0,
>stat=Data format error
>
>Apr 24 21:54:19 www sendmail[14883]: n3P2sIXc014880:
>to=<testing-boun...@mydomain.com>, delay=00:00:01, mailer=local, pri=121602,
>dsn=5.1.1, stat=User unknown


Apparently, the DSN can't be returned to testing-boun...@mydomain.com.
This is also a problem. Do you have a full set of aliases for this
list?


>Apr 24 21:54:19 www sendmail[14883]: n3P2sIXc014880: n3P2sJXc014883:
>postmaster notify: User unknown


Is this message a list welcome message or a confirmation request?

Check the relevant template for problems, although I can't imagine what
they'd be. The welcome template is subscribeack.txt, the confirmation
request is verify.txt. The default templates are in templates/LL/
where LL is the list's prefered language code or the code of the
user's preferred language, but there could be list specific templates
in lists/LISTNAME/LL/, domain specific templates in
templates/DOMAIN/LL or site specific templates in templates/site/LL.

Also check Mailman's logs.

Does Mailman work otherwise? Is it able to send other mail?

A quick google for 'sendmail "data format error"' indicates this may
mean that the sending domain (mydomain.com) may not have DNS records.

-- 
Mark Sapiro <m...@msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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