(reason: 550 5.1.1: Recipient address rejected: User unknown in local recipient table)

I have setup my domains in Virtualmin running Centos 6.4 64bit. My domains receive emails successfully most of the times but sometimes the email is not received and the sender gets following:

(reason: 550 5.1.1 : Recipient address rejected: User unknown in local recipient table)

Not sure what the problem can be. Please help

Howdy,

Are you saying this particular address sometimes works, and sometimes doesn’t?

Or does this particular address fail all the time?

-Eric

It sometimes work and other times not.