On 2/6/25 7:10 PM, Wietse Venema via Postfix-users wrote:
You can force this witH;

/etc/postfix/master.cf
     relay .. .. .. .. .. .. smtp
        flags=O

/etc/postfix/main.cf:
     relay_destination_recipient_limit = 1
     transport_maps = hash:/etc/postfix/transport

/etc/postfix/transport
      example.com relay:[internal-mailhub.example]

Since I use virtual_alias_maps rather than relaying entire domains as relay_domains apparently would do, I haven't quite wrapped my head around yet how this interacts. If anybody else finds it interesting, this *doesn't* work:

/etc/postfix/master.cf
    virtual .. .. .. .. .. .. virtual
        flags=O
    relay .. .. .. .. .. .. smtp
        flags=O

/etc/postfix/main.cf:
    virtual_destination_recipient_limit = 1
    relay_destination_recipient_limit=1
    virtual_alias_domains = ...
    virtual_alias_maps = lmdb:/etc/postfix/virtual

Regards,

ell1e


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