[exim] Sender verify failed

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Author: Marten Lehmann
Date:  
To: exim-users
Subject: [exim] Sender verify failed
Hello,

what is exim exactly doing when it does a verification of the sender? I
get the following message:

550-Verification failed for <userpart@???>
550-Unrouteable address
550 Sender verify failed

userpart@??? is just an example, the address used in realitity
does really exist, the mailserver is reachable from the mailserver and I
can't see any error. Exim doesn't tell me more detailed what is failing.
Is it doing a callback automatically? I just have "verify = sender"
without any additional options in the configuration. If it does: What is
exim using for "EHLO ???" and "MAIL FROM: ???" before it can do "RCPT
TO: userpart@???"?

Regards
Marten