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Monday, February 11, 2013

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Mail Sent error 550 5.1.1 Recipient address rejected: User unknown invirtual mailbox table

I have some webservers and hundred of domains, and the other day i create 4 domains for a customer, and 2 of the domains have in same machine the emails, and the other 2 in thirth party servers as Gmail o Yahoo, and when user send email from one of 2 servers to other externals server get this error:
Plesk NOQUEUE: reject: RCPT from localhost[]: 550 5.1.1 : Recipient address rejected: User unknown in virtual mailbox table; gmail

I search for solution and the problem is that the server try to send email, but postfix and plesk configured the mail for external email in same server, and then don't work correctly, the solution is disable each mail internal server for external domain mail servers:
/usr/local/psa/bin/domain -u mydomain.com -mail_service false

About David Millán Escrivá

David completed his studies in Universidad Politecnica de Valencia in IT with a Master's degree in artificial intelligence, computer graphics, and pattern recognition, focusing on pattern recognition and Computer Vision. David has more than 15 years of experience in IT, with more than ten years of experience in Computer Vision, computer graphics, and pattern recognition, working on different projects and start-ups, applying his knowledge of Computer Vision, optical character recognition, and augmented reality. Co-Author of two OpenCV books and reviewer of few more.


  1. thanx, that fixed my problem...had the same :)

  2. 10x man , you just saved my day !

  3. Hey! thanks! you saved my life!

  4. Hi! Have you found a solution to this problem, I am facing it right now...

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  6. tried this, but unfortunately, no joy.