No one has responded to this discussion for at least a year, so this information may be out of date. If you're looking for information about this topic, please search for a more recent discussion or post a new question.

#550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ## returned for live mailbox

This question has suggested answer(s) This question has suggested answer(s)

Hi,


I have a client on Microsoft Office 365 Plan P1, a person sending email to them is receiving the following bounceback message:


#550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##


but the account seems to be working normally apart from this issue. Please advise.


Regards


Matt

All Replies
  • Hello Matt,

    Usually this means there's a typo in the recipient address that the email is being sent to, such as an extra character like a period or what not.  Be sure to check that you can send messages to this account by it's primary SMTP address.  If that works, examine the NDR that is received to check what it shows as a recipient in the header information.

    0 out of 1 people found this post helpful.