Unable to receive emails to particular email account in Plesk: User unknown in virtual mailbox table

Alexander Davydov

Updated January 13, 2026 19:09

Plesk for Linux

Applicable to:

Unable to receive emails to a particular email account with the following error message in /var/log/maillog file:

550 5.1.1 john.doe@example.com: Recipient address rejected: User unknown in virtual mailbox table

Postfix virtual_alias_maps misconfiguration. Namely the recipient address is missed in the Postfix virtual_alias_maps configuration:

# postmap -s /var/spool/postfix/plesk/virtual | grep john.doe@example.com
#

Connect to the server via SSH.
Add missing alias for the affected mailbox:

# echo "john.doe@example.com john.doe@example.com" | postmap -i hash:/var/spool/postfix/plesk/virtual

if it does not help after migration, remove mail account and re-migrate subscription mail content

Note: replace john.doe@example.com with the appropriate email account from the error message.

0 comments

Please sign in to leave a comment.