[IMail Forum] X-RCPT-TO: Problem

[Andy Doran - Fasthosts Internet Ltd.]

Dear All IMailers

Does anyone have knowledge of the SMTP header option X-RCPT-TO: ?
At the moment I am receiving around 1000 messages an hour - not one of these
messages is addressed to my domain (most if not all of them are junk spam
messages to <undisclosed recipients> or variations on that theme), the only
thing they have in common is that my domain is listed under the X-RCPT-TO:
header.

The mails come from multipe sources, so restricting Access Control is not
really feasible. Any ideas as to why multiple spammers would choose my
domain? Why does IMail get stuck with the mails, rather than rejecting them
as undeliverable (I had to create a pop box and setup up a 'nobody'
forwarder to drop all emails into the box, otherwise they just hung around
the system, not going anyway and causing SMTPd to take all CPU time)?

Andy Doran

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