Thanks for clearing that out! Then my next question would be: is there something that would implement SRS in forwarding within XMailserver?
Sincerely, Bart Mortelmans CLEMENT Francis wrote: >> -----Message d'origine----- >> De : [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] la part de Bart Mortelmans >> Envoy=E9 : vendredi 27 avril 2007 09:41 >> =C0 : [email protected] >> Objet : [xmail] Re: Dynamic DNS / Don't use SPF >> >> >> SRS has a couple of problems, which make me assume that it's not going = >> > > >> to really get anywhere: >> >> 1) If you implement SPF, then you have to rely on the fact that=20 >> forwarding services of your recipients implemented SRS. >> > > The "mail from" rewrite done by srs on forwarded mails will be used as = > is by > any no 'srs' intermediate server on any next hops in the route to the = > final > server (that have not to be 'srs' too) > > >> 2) The from address gets mocked up. Making it not very "user = >> > readable". > > NO, it's the SMTP "MAIL FROM" that is changed NEVER the 'From' field in = > the > mail itself > The 'user' never see the 'Mail From' in any mua 'normal' views, but = > only > when wanting to view de complete headers and if the smtp servers added = > some > info about the real 'mail from' used in the smtp transaction. > The 'From' is not derived from the SMTP "MAIL FROM", as the From is = > allready > in the mail header and written by the sender mua=20 > > >> 3) The from address SRS created would change from time to time (it=20 >> includes a time stamp). So the same person sending me two=20 >> mails, has two=20 >> different addresses. >> > > Yes at smtp level, false at 'mua' level :) > The final user see exactly the same address > > >> 4) The from address SRS created is meant to expire (otherwise=20 >> abuse via=20 >> such an address would be possible). So replying to that e-mail you=20 >> received last week, won't work. Sure, you know all about SRS,=20 >> so you're=20 >> able to find out what the real address of the sender was. But=20 >> will your=20 >> mom be able to do so? >> > > False, as said, the mua use the From and Reply-to 'mail header' fields, = > not > the smtp "MAIL FROM" that they dont know nothing. > So replying is ok and never change. > > >> Basically it comes down to this: >> If you implement SPF, then you could assume that e-mails you send from = >> > > >> servers that are "trusted" according to SPF and that don't get=20 >> forwarded, are more likely to get through the spam filters. >> But your SPF record is best to also allow mails from other servers=20 >> simply because you never know if your recipient might be using=20 >> forwarding. >> >> Sincerely, >> Bart Mortelmans >> >> >> >> > > Francis > - > To unsubscribe from this list: send the line "unsubscribe xmail" in > the body of a message to [EMAIL PROTECTED] > For general help: send the line "help" in the body of a message to > [EMAIL PROTECTED] > > > - To unsubscribe from this list: send the line "unsubscribe xmail" in the body of a message to [EMAIL PROTECTED] For general help: send the line "help" in the body of a message to [EMAIL PROTECTED]
