Well to use other SMTP relay than the one from the used ISP is not allways possible, and
should be prevented anyway.
nearly 100% of the spam is caused by direct senders, very seldom they use the ISP's
so lets close that big spamfriendly hole.
My opinion of corse
---------- Original Message ----------------------------------
From: Bernard Dugas <bernard.dugas(a)is-production.com>
Date: Fri, 16 Feb 2007 08:47:44 +0100
Jean-Pierre Schwickerath wrote:
If you consider SPF to be the solution against
all kinds of SPAMs then
you will indeed be disapointed. SPF is meant to prevent the abuse of
your domain as mail envelope from address.
There are still worms out there that use harvested e-mail addresses as
sender. And when the people receiving this kind of spam come back to
you, you can at least tell them: hey, we published spf records to show
you which IPs are allowed to send mail with this envelope address. if
you don't check it and accept the obvious forgery, then it's your
And in complement to that, if we give to our customers some outgoing
smtp servers with authentification they can use from any hotel/wifi in
the world, there is no more reason that any email with your domain-names
are sent from other smtp servers than ours, published with SPF in DNS.
And the customer is happy because he doesn't have to change smtp server
each time he travels :-)
__________ Bernard DUGAS ________________________________________
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