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Topic: 554 Transaction failed: Duplicate header 'DKIM-Signature'

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 2021091301 (mariadb backend, dockerized eidtion:
- Deployed with iRedMail Easy or the downloadable installer? No
- Linux/BSD distribution name and version: Docker
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MariaDB
- Web server (Apache or Nginx): NGINX
- Manage mail accounts with iRedAdmin-Pro? No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

I have modifications to Postfix to send emails via AmazonSES, and I have configured Sieve to forward emails externally via Roundcube.

Amazon is rejecting emails to be sent due to Duplicate DKIM-Signatures. How can I configure iRedmail to remove them and prevent the problem?

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Spider Email Archiver: On-Premises, lightweight email archiving software developed by iRedMail team.

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Re: 554 Transaction failed: Duplicate header 'DKIM-Signature'

disable dkim singning then

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Re: 554 Transaction failed: Duplicate header 'DKIM-Signature'

Is it possible to disable it by the sender's domain as I know which domains already have a DKIM-Signature on them?

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Re: 554 Transaction failed: Duplicate header 'DKIM-Signature'

there is a guide for dkim singing