On Thu, Mar 13, 2025 at 02:55:00PM +0100, rog7993--- via Postfix-users wrote:
> In simple terms, the configuration looks like this:
>
> /etc/postfix/main.cf:
> virtual_alias_domains = example.com
> virtual_alias_maps = hash:/etc/postfix/virtual
> transport_maps = hash:/etc/postfix/transport
>
> The new requirement is to route some mail
> addresses of the mail domain without address rewriting. I am aware that this
> could in principle be
> realized via a rule in "transport_maps", e.g:
>
> /etc/postfix/transport:
> us...@example.com smtp:[some_other_destination]
>
> But then the mail is rejected in the SMTP handshake as soon as it is sent:
>
> Recipient address rejected: User unknown in virtual alias table
As documented, all valid recipients in domains listed in
virtual_alias_domains MUST be rewritten to some real domain,
that's the definition of "virtual" in a "virtual alias domain".
> How could this be solved in the existing configuration with
> virtual_alias_maps?
You have two choices (the first is probably simpler):
1. Remove the domain from virtual_alias_domains, and instead
list it in virtual_mailbox_domains:
main.cf:
virtual_mailbox_domains = example.com
default_database_type = hash
indexed = ${default_database_type}:${config_directory}/
virtual_alias_maps = ${indexed}virtual
virtual_transport = relay:[mailstore.example]
transport_maps = ${indexed}transport
virtual:
...
# Delivered verbatim via $virtual_transport
us...@examp.com us...@example.com
2. Leave the domain alone, but rewrite the recipient address
back to original form during delivery:
main.cf:
virtual_alias_domains = example.com
default_database_type = hash
indexed = ${default_database_type}:${config_directory}/
smtp_generic_maps = ${indexed}generic
virtual_alias_maps = ${indexed}virtual
transport_maps = ${indexed}transport
virtual:
...
# Transient rewrite
us...@example.com us...@example.com.verbatim.invalid
transport:
example.com.verbatim.invalid relay:[mailstore.example]
generic:
# Undo recipient rewrite
us...@example.com.verbatim.invalid us...@example.com
--
Viktor.
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