Cannot connect an E-Mail Account to Zammad


  • Used Zammad version: 3.6
  • Used Zammad installation source: source
  • Operating system: Ubuntu 20.04
  • Browser + version: Firefox 86

Expected behavior:

  • Connecting to an E-Mail Account
  • Connecting to Microsoft Online 365

Actual behavior:

  • Email Setting: Cannot assign requested address - connect(2) for [2603:1026:c0b:22::2]:993
  • Microsoft 365 Settings: Cannot assign requested address - connect(2) for [2603:1026:c0b:22::2]:993

I was trying to connect an Account from Office 365. But I just get these errors. I follwed the configuration process.
SMTP trough office 365 works somehow.
I disabled ipv6 and opened alle needed ports on my machine

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