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Strange problem

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Frank.Elsner at TU-Berlin

Jul 10, 2012, 6:23 AM

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Strange problem

Hello,

we've a strange problem with our central mail relay.

We allow unauthenticated relaying for all hosts in our network (130.149.0.0/16),
which works. But today the following problem came up for one user:

Exim log shows:

2012-07-10 14:08:42 H=pc-45-77.isr.tu-berlin.de [130.149.45.77] F=<source [at] isr> rejected RCPT <destination [at] web>: relay not permitted, authentication required

Ups, this IP is from our network! Needs investigation.

[root [at] mailfrontend- /]# exim_checkaccess 130.149.45.77 destination [at] web -f source [at] isr
Accepted
[root [at] mailfrontend- /]#

Oha!

And furthermore "exim -d -bhc 130.149.45.77" ends with

..
processing "accept"
check hosts = +relay_hosts : !+smtpauth_hosts
cached yes match for +relay_hosts
cached lookup data = NULL
host in "+relay_hosts : !+smtpauth_hosts"? yes (matched "+relay_hosts" - cached)
accept: condition test succeeded
SMTP>> 250 Accepted

What's this?

Kind regards,
Frank Elsner

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exim-users at spodhuis

Jul 10, 2012, 12:01 PM

Post #2 of 2 (274 views)
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Re: Strange problem [In reply to]

On 2012-07-10 at 15:23 +0200, Frank Elsner wrote:
> We allow unauthenticated relaying for all hosts in our network (130.149.0.0/16),
> which works. But today the following problem came up for one user:
>
> Exim log shows:
>
> 2012-07-10 14:08:42 H=pc-45-77.isr.tu-berlin.de [130.149.45.77] F=<source [at] isr> rejected RCPT <destination [at] web>: relay not permitted, authentication required
>
> Ups, this IP is from our network! Needs investigation.
>
> [root [at] mailfrontend- /]# exim_checkaccess 130.149.45.77 destination [at] web -f source [at] isr
> Accepted
> [root [at] mailfrontend- /]#

Do you have different rules for port 25 and port 587, with port 587
requiring authentication?

log_selector = +incoming_port

-Phil

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