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Comment by Bender

And also disable MDN's [1] in stand-alone email clients and discard them in MTA's if your user-base is cool with it.

    # grep MDN /etc/postfix/header_checks  change WARN* to discard to drop them.
    /^Subject: MDN: /    WARN MDN_Seen_1000
    /^Subject: Read-Receipt-To: /   WARN MDN_Seen_1001
    /^Subject: Disposition-Notification-To: / WARN MDN_Seen_1002
    /^Message-ID: \<receipt/   WARN MDN_Seen_1003
    /^Subject: Read: /    WARN MDN_Seen_1004

using WARN as testing example, change to DISCARD to drop them

[1] - https://en.wikipedia.org/wiki/Return_receipt

parent Bender 1 year ago

Comment by Bender

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