SPF says which machines are allowed to send e-mail as yourdomain.com. It is basically a list of permitted senders. For example:
"v=spf1 a:mail1.yourdomain.com ~all" This says that only one machine, mail1.yourdomain.com, is allowed to send e-mail for yourdomain.com. All others are frauds. If I'm a spammer and send spam as yourdomain.com, most mail servers will say NO! That's not a permitted sender. My "spam" software will either continue to get rejected OR learn from the permanent rejection and try domains that don't have spf records. Either way, your server will not get NDR's (non-delivery reports), because the mail server gettng spammed will never attempt to deliver it. That server will just outright reject it. Implementing SPF won't stop all of the NDR's to your address, but it should significantly reduce it since many of todays mail servers are spf aware. Thanks, Erik On 4/19/06, Richard Baxant <[EMAIL PROTECTED]> wrote: > Thanks ... I don't completely understand how it works if spammers are > generating fake emails on a separate machine? > > I have implemented SPF, so all I can do is wait and see what happens. > > Thanks, > Richard > > On 4/18/06, Erik Espinoza <[EMAIL PROTECTED]> wrote: > > You may want to publish SPF records. This will allow you to designate > > which hosts are allowed to send e-mail as yourdomain. For more info on > > publishing SPF records, please refer to http://www.openspf.org/ > > > > Thanks, > > Erik > > > > On 4/18/06, Richard Baxant <[EMAIL PROTECTED]> wrote: > > > As of late in my great fight against spam I have started to receive > > > NDRs (non-delivery reports) > > > where the spammer sends spam as non existent users with my domain and > > > then I get all these NDRs. > > > > > > Can anyone tell me how to stop this? > > > > > > TIA > > > > > > --------------------------------------------------------------------- > > > QmailToaster hosted by: VR Hosted <http://www.vr.org> > > > --------------------------------------------------------------------- > > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > > > > --------------------------------------------------------------------- > > QmailToaster hosted by: VR Hosted <http://www.vr.org> > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > --------------------------------------------------------------------- > QmailToaster hosted by: VR Hosted <http://www.vr.org> > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- QmailToaster hosted by: VR Hosted <http://www.vr.org> --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
