From: AlxFrag (alxfraggmail.com)
Date: Fri May 16 2008 - 04:25:06 CDT

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mouss wrote:
> AlxFrag wrote:
>>
>> All i want to do is to relay emails from users that are SASL
>> authenticated.
>>
>> It is also desired to relay emails from users with the correct "from
>> address".
>>
>> With the current configuration when a user tries to send an email
>> using a different username that he has used to login, he gets the
>> error:
>>
>> Failed to add recipient: testmydomain [SMTP: Invalid response code
>> received from server (code: 553, response: 5.7.1 <test1mydomain>:
>> Sender address rejected: not owned by user test)]
>>
>> The problem appears when a user has activated a forwarding mechanism
>> to a different mail server and forwarded messages are sent to my server.
>
> Enforcing authentication breaks forwarding ;-p
> There is nothing you can do about this except reject the forwarded
> mail or accepte non authenticated mail...
>
> suppose user A sends mail to an external account which forwards to
> user B (both A and B are in your domains). then your server will get
> mail with A as sender from an external MTA (which won't auth because).
> and the problem is related to B setup, so you can't just exclude A
> from your sender login maps.
>
> you can however accept unauthenticated mail from a list of MTAs, but
> that may be a lot of work...
>
>>
>> I don't know if it is possible with postfix to:
>>
>> 1) Relay emails only from sasl authenticated users,
>> 2) force the users to use their real username for sending emails,
>> 3) accept forwarded messages from other mail servers.
>
>
ok thanks. I think enforcing authentication is more important than
forwarding.

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