On 9/7/2010 4:36 PM, Jan-Frode Myklebust wrote:
On Tue, Sep 07, 2010 at 08:20:36PM +0200, Jeroen Geilman wrote:
On 09/07/2010 06:57 PM, mouss wrote:
OP is an ISP providing outbound relay to residential users. his
problem is not easy to solve.
Thanks for understanding. I´ve gotten information off list that gmail
are setting the sender to the gmail authenticated user when sending from
non-gmail addresses. So I´m at least not alone in thinking this should
be a good solution.
Postfix has no mechanism to selectively rewrite the envelope
sender, nor does postfix have a mechanism to set "envelope
sender = auth user". You'll need a milter to do that.
Also I believe you have to pre-register any address you want to send
from trough gmail, which sounds like we could use postfix´
smtpd_sender_login_maps to implement a similar solution.
You could use the sender login maps to reject mail with
"unregistered" auth/sender combinations.
If you have customers sending large amounts of abusive mail,
seems as if there would be better ways to deal with that eg.
sender quotas, monitoring of undeliverable mail, inbound
spam/virus scanning, etc. But I'm not an ISP; I can fire
anyone who abuses the mail system.
and I still fail to understand how controlling your customers
envelope sender will help with backscatterer.org.
-- Noel Jones
