Filter privacy-sensitive headers on outgoing mail
This re-implements part of PR #69 by @mkropat, who wrote: By default, Postfix adds a Received header — on all mail that you send — that lists the IP of the device you sent the mail from. This feature is great if you're a mail provider and you need to debug why one user is having sending issues. This feature is not so great if you run your own mail server and you don't want every recipient of every email you send to know the device and IP you sent the email from. To limit this filtering to outgoing mail only, we apply the filters just to the submission port. See these guides [1] [2] for more context. [1] http://askubuntu.com/a/78168/11259 [2] http://www.void.gr/kargig/blog/2013/11/24/anonymize-headers-in-postfix/
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