On Mon, May 06, 2024 at 11:37:54AM +0200, Дилян Палаузов via Postfix-users 
wrote:
> Hello,
> 
> postconf(5) contains:
> 
> virtual_alias_domains (default: $virtual_alias_maps)
> virtual_alias_maps (default: $virtual_maps)
> virtual_maps (default: empty)
> 
> Thus virtual_alias_domains is by default emtpy.
> 
> VIRTUAL_README says:
> • NEVER list a virtual alias domain name as a mydestination domain!
> • NEVER list a virtual MAILBOX domain name as a virtual ALIAS domain!
> 
> My reading is that a domain in virtual_alias_domains can be mentioned
> neither in virtual_mailbox_domains nor as mydestination domain.

Please see https://www.postfix.org/ADDRESS_CLASS_README.html#classes
(or a local copy of that file) for what each domain list is for,
and how Postfix looks up valid recipient addresses.

        Wietse

> What can be put in virtual_alias_domain, when virtual_mailbox_domain and 
> mydestination are set?  Why cannot this value always be put in 
> virtual_mailbox_domains?
> 
> Having a domain in virtual_mailbox_domains implies that domain is handled by 
> virtual aliases provisions.  I think it will be useful to extend one of 
> existing examples in VIRTUAL_README with a case, where both 
> virtual_alias_domains and virtual_mailbox_domains are set.
> 
> Greetings
>   Дилян
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