On Tue, 2009-07-14 at 23:14 -0700, HerbEppel wrote:
> No doubt this has been discussed before and apologies for any repetition, but
> I can't find the answer in the archive.
>
> I have set SA to reject all mail that isn't addressed to specific addresses,
> but quite a lot of spam gets through by using arbitrary addresses in the To
> field and a 'good' address in the Envelope-to field.
The Envelope-To field actually specifies the mailbox which will receive
that email. The "To:" field (in the mail header and usually seen by the
user) was set by the original mail author is technically ignored for
delivery (because otherwise you wouldn't receive e.g. any mailinglist
mails).
> How can I rectify this?
Fixup the MTA configuration to accept only mails to really existing
mailboxes (for explicitly configured domains etc.) and *reject* all
others (implying that it's not necessary to spamcheck them).
Bernd
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