Xero.com provide a feature which requires the use of an ! in the email address
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:
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
To my knowledge I am afraid there aren't changes which can be done on Office 365 side.
Please contact xero support and see if they can help with issue.
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