Article ID: 123931, created on Dec 15, 2014, last review on Aug 15, 2015

  • Applies to:
  • Plesk 12.0 for Linux
  • Plesk 11.0 for Linux
  • Plesk 11.5 for Linux


When sending an email to a non-existent user (i.e., which is in Subscription domain, the email is forwarded to an external address (i.e. externalemail@someserver.tld) as per the 'What to do with mail sent to nonexistent users' option under the 'Mail settings'.

Additionally, if the email is sent to a non-existent user (i.e. nonexistuser@domainadd.tld), which is in additional domain, NOT in the Subscription domain (i.e., a bounce back with the following error is received:

Recipient address rejected: User unknown in virtual mailbox table


"catch-all" address is not set for the additional domains.


Update bounce settings for the affected domains by executing the following command:

# /usr/local/psa/bin/subscription_settings -u <affecteddomain.tld> -no_usr <>

Search Words


catchall additional domains


SMTP Error (550): Failed to add recipient (5.1.1 : Recipient address rejected: User unknown in virtual mailbox table) .


catchall not functioning


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