Forward mail for certain user(s) to another SMTP server

[Radu Popa]

Hello,

as the subject says I would like to forward the mails for certain users
to another host which has a SMTP server listening on port 25. I am using
postfix + amavis.

Thank you!

[mouss]

== virtual_alias_maps:

f...@example.com b...@example.org

== transport_maps:
example.org relay:[192.0.2.3]

the transport entry is not needed if example.org has an MX pointing to
the right host.

[Radu Popa]

Thanks,

but the two servers are internal and have the same domain: test.org., so
I would need to forward the message from som...@test.org to
server2.test.org:25.

I could also do the following:

1. Setup the forwarding towards a sub-domain (f...@test.org
->b...@sub.test.org)
2. Define in the DNS the MX record for sub.test.org as server2.

But I was wondering if there is any other way?

Regards

[Jan P. Kessler]

Radu Popa schrieb:

> Thanks,
>
> but the two servers are internal and have the same domain: test.org.,
> so I would need to forward the message from som...@test.org to
> server2.test.org:25.
>
> I could also do the following:
>
> 1. Setup the forwarding towards a sub-domain (f...@test.org
> ->b...@sub.test.org)
> 2. Define in the DNS the MX record for sub.test.org as server2.
>
> But I was wondering if there is any other way?

Simply follow mouss' advice:

main.cf:
---------
transport_maps = /etc/postfix/transport

/etc/postfix/transport:
-----------------------
f...@test.org smtp:[1.2.3.4]

[Radu Popa]

Hi,

it works OK, but the messages pushed the TO filed states:
undisclosed-recipients:;

Do I have to set anything within the configuration files?

[mouss]

Radu Popa wrote:
> Hi,
>
> it works OK, but the messages pushed the TO filed states:
> undisclosed-recipients:;

ahuh? virtual aliases do not change headers.

what server is running on the remote machine?

>
> Do I have to set anything within the configuration files?
>

use generic_maps to rewrite addresses back to their original form:

b...@example.org f...@example.com

[Radu Popa]

The other server is a Domino 7.

[mouss]

Radu Popa wrote:
>
> The other server is a Domino 7.

Then use generic_maps as I said in my last post. this will rewrite back
the address so that your domino thing don't get mad.

in short, virtual_alias_maps will force the transport, and generic will
reset the address.

an alternative is to use transport_maps:

f...@example.com relay:[192.0.2.3]

this way, you don't need virtual aliases and generic. be warned that
transport_maps are "latency sensitive", so if you use *sql/ldap, you
must make sure the connection never fails.