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. 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. > > > Residential users don't often have their own mail servers/domains. > Limiting these to sending with their true ISP address is fairly common. > (And just about the only sane way to implement this kind of relay) In Norway all/most ISPs are forcing their residential users trough the ISP`s smarthosts. Outgoing port 25/tcp is blocked. So users are not allowed to run their own mailservers. I can´t justify also requiring all users to use the ISP´s mail addresses. -jf
