I have a server using Paralells 11.09 on a Centos 6 server, and my email account is hosted on there. About 2 weeks ago while emailing a client I received the following message from Evolution (my email client):
The reported error was "RCPT TO <firstname.lastname@example.org> failed: <email@example.com>: Recipient address rejected: User unknown in virtual mailbox table".
I thought it was an error with Evolution so I tried to send the email from my webmail account. But I received the same error when sending an email to that address.
I've tried sending emails to other accounts from the email account held on the server and they send fine and do not come up with this error. This error only occurs when I email this particular client from my email account on this server. If I send an email to his account from an alternative account held elsewhere I don't get this error.
What is going wrong?