[mdlug] AT&T DSL and postfix

[Jesse Salens]

I used to run into this issue frequently when using AT&T at customer sites
with a company I used to work for. Our installed servers needed to relay
mail back to us but AT&T blocks port 25 by default. You may want to opt out
of port 25 blocking to send directly instead of through AT&T's mail servers.

http://helpme.att.net/servabuse.php

Under abuse type, select **Opt out Port 25. Wait 30 minutes and cycle your
modem.

-Jesse

On Wed, Oct 15, 2008 at 2:19 AM, Michael ORourke <mrorourke at earthlink.net>wrote:

> Lug nuts,
>
> Not sure if any of you have run into this recently... but I was setting up
> a
> postfix email server which is on an AT&T DSL (with a dynamic IP) and I
> configured it with SMTP AUTH, so that it could use AT&T's smtp server as a
> smart host (relay host).  But I keep getting the following error...
> ###snipped from /var/log/mail.info
> Oct 14 18:37:54 ark postfix/smtp[14772]: EFD0A106309:
> to=<mrorourke at XXXXXXXX.net>, relay=68.142.229.41[68.142.229.41]:25,
> delay=246648, delays=246647/0.13/0.71/0.18, dsn=5.0.0, status=bounced (host
> 68.142.229.41[68.142.229.41] said: 553 From: address not verified; see
> http://help.yahoo.com/l/us/yahoo/mail/original/manage/sendfrom-07.html (in
> reply to MAIL FROM command))
> ###End
> The From address would be something like root at server.mydomain.net or
> mike at server.mydomain.net.
>
> Now if I change the masquerading settings so that the From address gets
> rewritten to a valid address on the AT&T network, such as
> myusername at sbcglobal.net , then it works.  But I don't want everything to
> be
> rewritten in that manner.  Eventually I would like to host our own domain's
> email.  But this doesn't seem possible.
>
> Maybe the solution is to change DSL providers???
>
> -Mike
>
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