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DevOps & SysAdmins: Postfix - User unknown in virtual mailbox table + authentification failed
Postfix: User unknown in virtual alias table
DevOps & SysAdmins: Postfix rejecting inbound mail to virtual mailboxes
User unknown in virtual mailbox table when sending an email to just one address
Postfix - Recipient address rejected: User unknown in local recipient table
Postfix: Recipient address rejected: User unknown in local recipient table even though it exists
Postfix: Recipient address rejected: User unknown in local recipient table, even though...
You’re Using Your Virtual Mailbox WRONG. (Fix it in 2026)
Mailserver creating mail accounts upon User unknown in virtual mailbox table on local delivery
DevOps & SysAdmins: postfix 550 relay not permitted for virtual mailbox domain
Postfix: Virtual Mailbox Mapping and Dovecot (2 Solutions!!)
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Last Updated: August 17, 2026
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