Subdomain email address in form not accepted

Infos:

  • Used Zammad version: 5.2.2-1663332227.317ec97e.bionic
  • Used Zammad installation type: Package
  • Operating system: Ubuntu 18.04
  • Browser + version: Safari

Expected behavior:

  • When entering an email address into the form sub domains (eg students.contoso.com) will be allowed to enter a ticket

Actual behavior:

  • When entering an email with a subdomain the field turns red and rejects the email

Steps to reproduce the behavior:

  • Set up website with form and use email address that has a subdomain.

I think the source of my issue is the the EmailVerifier. My subdomain has public MX records, but not in my internal DNS server. I’ve added the records, but I think the local cache needs to be cleared. Does EmailVerifier have its own cache or can I just clear the DNS cache and it will catch on?

Fixed the issue.

Created the MX records on our local DNS server, flushed the DNS cache on the Zammad server and everything is right with the world.