On Mon, Feb 03, 2025 at 05:56:45PM -0500, Wietse Venema via Postfix-users wrote:
> There is no built-in featrue to delete IP addresses from headers.
But, given the expected header form, it is not difficult to craft a PCRE
table that does the job well.
> If this is for messages submitted on port 587 (submission) or 465
> (smtps or submissions), then you can simply delete all Received:
> message headers, because there shuold be only one.
>
> master.cf:
>
> submission .. .. .. .. .. .. .. smtpd
> -o { header_checks = pcre:{{/^Received:/ IGNORE}} }
> ...other -o options...
>
> submissions .. .. .. .. .. .. .. smtpd
> -o { header_checks = pcre:{{/^Received:/ IGNORE}} }
> ...other -o options...
>
> This is much simpler than some of the on-line discussions.
Though one might want to be prepared to encounter more friction for
outbound mail lacking all upstream Received headers. These tend to
be classed more "spammy".
--
Viktor.
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