On Fri, 2005-05-20 at 10:58 +0100, Mark Smith wrote:
Are there any *valid* reasons for a mailserver's HELO greeting not matching the hostname obtained from rDNS?
Not really. However you are technically not allowed to reject based on HELO strings
RFC lawyers keep claiming that, while forgetting that site security policy always overrides.
That said, some large mail sources you might prefer not to block (AOL, Ebay) are noncompliant in this regard.
- Jeremy
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