- Used Zammad version: 3.1.0
- Used Zammad installation source: deb-package
- Operating system: Ubuntu 18.04
- Browser + version: Firefox + Vivaldi latest
- Tried to configure our Exchange 2016 server as IMAP+SMTP. With a successful integration.
- After setup of SMTP, the message “Error 501 5.5.4 Invalid Domain Name”
Steps to reproduce the behavior:
- nginx is configured to server infra-zammad-01.internal.company.com infra-zammad-01
- Log File shows no error both from Zammad instance as from the Exchange Server.
- SMTP works with several other services
- Domain request is enabled on the Exchange Server 2016