From: mouss (moussnetoyen.net)
Date: Sat Apr 26 2008 - 06:12:30 CDT

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El Neofito wrote:
> [snip]

first, few notes about your postconf -n:
- consider setting mynetworks explictely instead of using mynetworks_style.
- you are an open relay to all dyndns.org subdomains. remove dyndns.org
from your relay domains.
- xxmail.dyndns.org is bothe in mydestination (via $myhostname) and
relay_domains. apparently, you don't need relay_domains at all, so set
it to an empty list:
relay_domains =
- canonical is preferred over sender canonical.

> localhost:10025 inet n - n - - smtpd -o content_filter= -o receive_override_options=no_unknown_recipient_checks,no_header_body_checks,no_address_mappings
>

so your 10025 smtpd peforms the same smtpd restrictions as your "main"
one (port 25). also, you use "smtp" as the transport to the content
filter, which means you use the "standard" timeouts. same thing for the
smtpd on port 10025. This may explain your problem.

you should read
    http://www.ijs.si/software/amavisd/README.postfix.html
and follow the recommendations there, unless you really know why.

> [snip]
>
>

I don't see anything obvious except the timeouts issue. try telnet to
ports 10024 and 10025 and see which one drops the connection. you can
also run amavisd in debug mode to see more logs.

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