[cobalt-users] Prevent Relay based on from address

[craig <craig@xxxxxxxxxxxxx>]

Hi I have POP before smtp running fine
Howverf anyone know if its allso possible to reject relaying unless the
from address is not in the domain that is hosted on the server.
as I have a few users using http://www.mailwasher.net
what it does is bounce email back to spam sender but it FAKEs the from
address to be the spammers form address not there domain.

what that means is your servers IP address shows in the headers and this
return bounce is spam

Now if I could also add an rule to sendmail to say that if there domain is
not in the form address I would stop them doing this

In the mean time I have shut the user acesss to sendmail using ipcahins
but been dialup users there IP changes so that is not a long term

so a rule like pop before smtp and form must have domain that is hosted
would be good