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Recipient address rejected: User unknown in virtual mailbox table" when sending an email to just one address - Super User
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Rule for e-mail forwarding if local mailbox / e-mail address cannot be found - Help with Setup/Upgrade - Mail-in-a-Box Forum
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550 5.1.0 <*****@******.pl>: Sender address rejected: User unknown in virtual mailbox table - Google Workspace Admin Community
12.0] Recipient address rejected: User unknown in virtual mailbox table · Issue #51704 · odoo/odoo · GitHub
LDAP. Recipient address rejected: User unknown in virtual mailbox table; · Issue #1650 · docker-mailserver/docker-mailserver · GitHub
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