Benny Pedersen wrote:
> On Tue, May 6, 2008 23:06, mouss wrote:
>> you rely on the sender address, make sure to reject it in your smtpd
>> (you don't want to give spammers an open road).

> that was why i sugested spf

blocking a sender in postfix is trivial. adding SPF support requires
additionnal software (and configuration...).

also, he can block a set of "internal/reserved" senders, and still allow
the domain (In contrast, SPF applies to the whole domain).