Does any other persons use a test on the validity of the MX record of
the sending domain? Not just that there is a MX but also that it is
not a RFC 1918 address or a loopback address?
Postfix allows it with check_sender_mx_access and I always find it
very useful but it fails with Sourceforge:
https://sourceforge.net/tracker/index.php?func=detail&aid=1435118&group_id=1&atid=200001
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