I notice that rcpthosts on our mail servers can be circumvented by using
the machines ip addressx in the recipient, e.g.:

rcpt to:<crap%spam.com@\<hostname-of-mailhost\>>
553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)

but

rcpt to:<crap%spam.com@[\<ip-address-of-mailhost\>]>
250 ok

Why is this? How do I turn it off?
Cheers.

Mark Powell - UNIX System Administrator - Clifford Whitworth Building
A.I.S., University of Salford, Salford, Manchester, UK.
Tel: +44 161 295 5936  Fax: +44 161 295 5888  www.pgp.com for PGP key
[EMAIL PROTECTED] (spell salford correctly to reply to me)

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