Author: Alexander Sabourenkov Date: To: ODHIAMBO G. Washington CC: exim-users Subject: Re: [Exim] reverse lookup on envelop senders - dealing with spam
ODHIAMBO G. Washington wrote: > Some clever? spammers are lurking around, for example I did receive
> which looks like this:
>
>
[...]
> Now that IP is not in our netblock, and so I believe their helo should
> have been blocked if I was bright enough. The problem is, they are
> one step ahead of me.
>
> To keep off spammers, I'd like to do reverse lookups on envelope senders
> and separately, to deny any envelope senders who say they are from our
> domain (wananchi.com) but are sending from another IP range other than
> our a.b.c.d/19 and e.f.g.h/25 *unless* they use ASMTP.
>
> Anyone already doing this???
Beware of roaming/remote users using their own/other than your relays.
