Xero.com provide a feature which requires the use of an ! in the email address

Paul 1 Reputation point
2022-01-31T17:29:55.93+00:00

Unfortunately, this causes the following NDR when sending an email to it:

Server error: '550 Mailcore(2503): Restricted characters in address'

An example of the email address format is such:

'bills.!******@xerofiles.com'

I read that an exclamation mark is a valid character in the local part of an email address, but Office 365 doesnt seem to like it.

Is there any way around this? I can Admin my tenancy if required, although I havent got a clue how to do it as I set it up years ago LOL

Thanks

Exchange Online
Exchange Online
A Microsoft email and calendaring hosted service.
6,172 questions
Exchange | Exchange Server | Management
{count} votes

Your answer

Answers can be marked as Accepted Answers by the question author, which helps users to know the answer solved the author's problem.