Birta Levente via Postfix-users:
> Hello
> 
> I have the following situation:
> default_transport=smtp
> -need to send to domain1 through smtpa, except if the sender is 
> from_special then send through smtpb
> 
> 
> smtp.....smtp
>      -o smtp_bind_address=ip1
> smtpa ..... smtp
>      -o smtp_bind_address=ip1
>      -o ......
> smtpb ..... smtp
>      -o smtp_bind_address=ip2
> -o ....
> 
> How can I achive this?

/etc/postfix/main.cf:
    # Limitation: this setting is overruled with FILTER and transport_maps.
    sender_dependent_default_transport_maps = inline:{
        { u...@example.com = smtpb } }

If you have many such users, use a cdb:, hash:, btree: or lmdb: file.

Avoid SQL/LDAP here, because the lookup happens in the critical
path of the Postfix scheduler.

        Wietse

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