Hello all,

We handle an email forwarder. Recently, we have been having more and
more issues with people reporting forwarded emails as spam, that end up
(probably) deteriorating the reputation of our email servers.

We have already set up:
- an antispam, but some emails marked as spam are even to human eyes not
  obviously spams, and mostly depend on how the recipient feels about it
- SRS
- Addition of Delivered-To and X-Original-To headers
- Forwarding the email to abuse@ or spam@ will help us feed it to our
  antispam

Do you know of additional best practices we could do, to better help
training our antispam as well as hopefully redirect at least some of the
reputation loss to the actual sender of the email?

Thank you,
  Leo Gaspard

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