[PLUG] Courier/Postfix relay after authenticating?

[Matt Alexander]

On Thu, 18 Mar 2004, D. Cooper Stevenson wrote:

> On Thu, 2004-03-18 at 12:54, Matt Alexander wrote:
> > Does anyone have an easy solution for allowing remote users to relay mail
> > through a mail server after they've been authenticated by the IMAP server?
> > 
> 
> I have a client who travels a lot. Unfortunately, there's no way to know
> in advance what network he's coming from so I check the sender's
> address. This way, if the sender originates from my_networks or they
> have a sender address of client at client.com then we relay the mail.
> 
> Yes, I know that a spammer could "hijack" this address and use the
> server to spam through it. I watch the server closely and it really
> hasn't been a problem. If someone tried that, I'd know about it almost
> immediately.
> 
> In /etc/postfix/main.cf:
> 
> smtpd_recipient_restrictions =
>     permit_mynetworks
>     check_sender_access hash:/etc/postfix/sender_access
>     reject_unauth_destination
> 
> In /etc/postfix/sender_access:
> 
> userone at yourdomain.com	OK
> usertwo at yourdomain.com	OK
> ....
> lastuser at yourdomain.com	OK
> 
> Note: be sure to "postmap /etc/postfix/sender_access" to has the file.

Thanks, Cooper!  I'll set this up so my users are happy while I
investigate some of the other solutions.
~M