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 Relay. so lets close that big spamfriendly hole.

My opinion of corse

---------- Original Message ---------------------------------- From: Bernard Dugas bernard.dugas@is-production.com Reply-To: swinog@swinog.ch Date: Fri, 16 Feb 2007 08:47:44 +0100

Hi,

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 problem.

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 :-)

Best regards,

__________ Bernard DUGAS ________________________________________ | | | Technoparc Pays de Gex mailto:bernard.dugas@is-production.com | | 30 Rue Auguste Piccard Tel.: +33 615 333 770 | | FR 01630 St Genis Pouilly Fax : +33 450 205 106 | |_________________________________________________________________|

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