On 2025-01-25 09:53, duluxoz via Postfix-users wrote:
> 
> Emails are permitted to be sent between all three domains.

I would try:

master.cf:
smtpd [...]
        -o virtual_mailbox_domains=example.com,example.org

main.cf:
virtual_mailbox_domains=example.com,example.org,example.internal

- this way the submission service would recognize all of the 3 domains,
while inbound smtpd only 2 of them and so it's respective *restriction
could hit rejection.
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