postfix rejects messages

Bernhard Reiter bernhard at
Fri Feb 4 15:00:57 CET 2005

On Wednesday 02 February 2005 17:11, likot wrote:
> I was following this thread but it died down. I have
> the same problem but diff. situation. Some of the
> roaming users can't use the kolab mailserver directly
> (ISP blocking port 25 etc..) so they can't
> authenticate to send email. When they try to send
> emails to local users at the kolab server relaying
> through their ISP's  mail server with a from header of
> an existing user of the kolab server it gets denied as
> invalid sender.

This means there is a different in header and enveloper from?
Usually there should not be such a difference.
Maybe you check the configuration and see why they
are sending email which is broken in this regard.

Also you could use your firewall to use another port
for incoming email from the clients. 
We also do that on one installation.

> Is there a way to let the kolab server accept the
> emails and don't check for the from header?

Yes, you can switch this security measure off,
but it means your users can to try to fake to be somebody else,
so it is not recommended in many settings.
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