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.!dbfjz.x4ye0qqkh4rk9izm@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

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