Temporary Return-Path check

Hi, recently I have encountered an issue where the email is being rejected due to the presence of Return-Path in the email.

I'm using Zitadel which sends out email with Return-Path in the headers (their code).

I noticed that mox rejects emails when Return-Path is presented. I'm wondering if mox can provide an option to disable this check.

I know complying with RFC is a good practise, but getting it resolved on Ziadel side is much harder. Nevertheless, thanks for your hardwork!

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