Gmail sent to server sometimes bounces with "SERVFAIL" error - sometimes doesn't
A client uses google workspace for their organization's email. Some people in the organization are able to email an account on the server (a different company that used the cpanels email for years without incident) fine but one person sending from the Google Workspace account always gets a bounce from Google:
Message not delivered
There was a problem delivering your message to person@domain.com. See the technical details below or try resending in a few minutes.
The response was:
DNS Error: DNS type 'mx' lookup of domain.com responded with code SERVFAIL
Tested with MXtoolbox and other tools and the dns is all good an in spec.
the server is running its own nameserver as per standard cpanel set up. The Googleworkspace organizations website is hosted on the server as well (in a seperate account of course)
Anyone have any idea what might cause this?