qmail-dmarc - verify using DMARC and queue a mail message for delivery
This module has been superseded by Mail::Qmail::Filter, especially Mail::Qmail::Filter::DMARC. It will eventually be removed from CPAN.
qmail-dmarc is designed to be called by qmail-smtpd instead of qmail-queue and will verify if incoming e-mail conforms to the DMARC policy of its sender domain:
If the environment variable
RELAYCLIENTexists, no verification is done, and the e-mail is immediately passed to
In any other case, we check if the message contains a valid DKIM signature matching the domain of the
From:header field. If this is the case, the e-mail is passed to
If not, but the message has a
From:domain contained in
/var/qmail/control/rcpthostsand the environment variable
DMARC_REJECTis set to a true value, the message is rejected with message
554 Valid DKIM signature required for sender domain ...
If not, a SPF check is done, and a
Received-SPF:header field is added to the message. Then we check if the message is aligned with its sender's DMARC policy. A
DMARC-Status:header field is added.
If the message does not align to the policy, the policy advises to reject such messages and when the environment variable
DMARC_REJECTis set to a true value, the message will be rejected with
554 Failed DMARC test.
In any other case the message is passed on to
Diagnostic messages are written as a single line to standard error, so you should find them in your
Apart from controlling the rejection of messages via the environment variable
DMARC_REJECT, none. It just works the way I need it. If you need it to operate in any other way, please let me know.
Copyright 2019 Martin Sluka.
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