Use Rspamd for DKIM signing

Rspamd supports DKIM signing. Since we also use it for SPAM filtering we can save one running application by using Rspamd also for DKIM.

  • Change Rspamd config
  • Add ed25519 as additional signing algorithm
  • Deploy new config
  • Either update DNS entries or migrate old DKIM keys
  • Test DKIM signing
Edited by Frederik Schwan
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