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User unknown in the virtual mailbox table?

There are times when you send an email and get a bounce back error message as the server tried to deliver the message but gave up on some network because the user/email account is unknown in the virtual mailbox table. For example-

x.x.x.x does not like recipient.
Remote host said: 550 5.1.1  <mailto:[email protected]> <[email protected]>:
Recipient address rejected:
User unknown in virtual mailbox table Giving up on x.x.x.x.

It seems like the recipient address was rejected because the user is unknown or does not exist. You can verify the recipient email account by using the online email verifier below :-


It helps you to find out if the mailbox to which you're sending the email actually exists or if it is created or not.

Sachin Monday 15 July 2013 - 8:41 pm | | Default

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