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=<[email protected]> rejected RCPT <[email protected]>: relay not 
> permitted, authentication required
> 
> Ups, this IP is from our network! Needs investigation.
> 
> [root@mailfrontend-4 /]# exim_checkaccess 130.149.45.77 [email protected] -f 
> [email protected]
> Accepted
> [root@mailfrontend-4 /]#

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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