Re: Spam pretending to be from a local domain
- At 01:33 AM 4/1/2007, LuKreme wrote:
>On 31-Mar-2007, at 03:08, Magnus Bäck wrote:Only if you intentionally send mail from non-existent addresses.
>Thanks. Are there any drawbacks to
>smtpd_reject_unlisted_sender = yes
>or the reject_unlisted_sender?
But you shouldn't do that.
These settings should be safe.
- alex handle wrote:
> On 3/31/07, Magnus Bäck <magnus@...> wrote:then the thing to fix is these mailers. reject_unlisted_sender is safe
>> On Saturday, March 31, 2007 at 04:29 CEST,
>> LuKreme <kremels@...> wrote:
>> > now, jfoc@... is not valid, so is there something I can set in
>> > postfix that will reject mail from unknown local users, or is there a
>> > reason I should not do this?
> I have implemented reject_unlisted_sender with warn_if_reject.
> Be careful i got a lot of false positives. Watch for bulkmailers, your or
> your customers webservers
and sane. you don't want to send mail that can't get a bounce in case of
errors, or can't replied to. if the bulkers don't want people replying,
provide them with one address (some people use noreply@....) that is
forwarded to you or some administrative account. but a -owner style
address as the envelope sender is appropriate here.