Hi Michelle,

It must be annoying... Does it concern only one company/client? Are all the domains declared for this company/client? Example: if your client is the company 'abcd', it's possible only the domains abcd.uk and abcd.us have been referred for England and USA. And if your user (sample: flavio.domino@abcd.it) is in Italy, the domain abcd.it has to be added inside the 'Domains' field. See attached screenshot.

Another possible cause could be an automatic 'out of office' answer from an attendee.

Another verification: Is the email address of an impacted user exactly the same everywhere, everytime, I mean for a valid ticket and a suspended one?

Good luck.