On Sat, 20 Sep 2008 14:41:30 +0200, mouss <[EMAIL PROTECTED]> wrote:
[...]
an alternative to BATV in this case (when all mail goes via your MTAs)
is to use "sub-addresses" (extensions):
-(output) use smtp_generic_maps to rewrite the envelope sender (only the
envelope sender. no header rewrite): [EMAIL PROTECTED] becomes
[EMAIL PROTECTED] (replace '+' with your preferred choice of
extension delimiter). (note that [EMAIL PROTECTED] would become
[EMAIL PROTECTED]).
-(input) there is nothing to do since extensions are built in postfix.
when you get a bounce, if it has "[EMAIL PROTECTED]", then you can
pass it (whitelist). otherwise, you can consider it as suspicious and do
more checks (reject without further checks would be too aggressive I
think).
regarding "yourtag", if this is constant, you won't have problems with
greylisters and list managers (some use the envelope sender to validate
membership). but you may still get some load of BS. you could change
this from time to time: change the tag every day, but at reception still
accept "recent" tags (you may accept tags for 1 month for instance. in
any case, you should accept them for at least one week). but with a
variable tag, you need to find a workaround for lists that check the
envelope sender.
Many thanks for your detailed reply. Your proposed approach is worth being
tried, I think.
Thanks also to Ralf for his short, but clear statement on batv-milter.
Regards,
Bernd
