[Exim] Solved: Spool write error message in mainlog

At 02:28 16/04/2001 +0100, I wrote:
>2001-04-16 03:08:24 14oxV9-000OfW-00 Message abandoned: Spool write error
>(Bad address) while receiving message from (host.name) [ip.address]
>2001-04-16 03:13:07 14oxZj-000OgE-00 Message abandoned: Spool write error
>(Bad address) while receiving message from (host.name) [ip.address]

I've found the problem.

In cooperation with the person who owns the server, and someone else, we
traced it back to a faulty reverse DNS.

The server resolved to a different IP, and the IP that it gave as itself
resolved to nothing. In the end it was an anti-spam measure that kicked in,
but with the wrong error message.

Phil? Is that possible?

Regards

Andromeda