Someone pointed out that SPF may cause other problems. A recent example: I ([EMAIL PROTECTED]) tried to email some abuse department, [EMAIL PROTECTED] This address was redirected to [EMAIL PROTECTED] My server delivers my email to MX1.example.com, which redirects the email. MX1.isp.com sees a mail from the IP of MX1.example.com, with the address [EMAIL PROTECTED], it then checks the SPF record for UFO-Net.nl and notices that MX1.example.com is not allowed to send this mail.
So probably everyone will end up with a SPF record that tells the other mailserver to just accept email from everywhere (even GMail uses this record!). The only use of SPF may be to skip some resource-expensive checks like spamassassin. Ivo ----- Original Message ----- From: "CLEMENT Francis" <[EMAIL PROTECTED]> To: <xmail@xmailserver.org> Sent: Thursday, April 26, 2007 4:39 PM Subject: [xmail] Re: Dynamic DNS > Just notice that using a 'external' relay server (even if it is your = > own > isp) can also be denies at final destination servers if the external = > relay > server is not declared in some way to be 'legitimate' to send mails of > behalf of the sending domain (I have in mind spf for example). > So the relay provider or you will (on dns with spf record for spf = > example) > have to do some work ... > If at this time spf and other 'sender server checks' algo are not = > largely > used, they will become. > > Francis > > >>-----Message d'origine----- >>De : [EMAIL PROTECTED] >>[mailto:[EMAIL PROTECTED] la part de Ivo Smits >>Envoy=E9 : jeudi 26 avril 2007 15:49 >>=C0 : xmail@xmailserver.org >>Objet : [xmail] Re: Dynamic DNS >> >> >>Rollernet (http://www.rollernet.us/) can provide you with=20 >>outgoing SMTP=20 >>relay services (not free). Your ISP may also provide you with=20 >>some (usually=20 >>free) email relay. It may even be possible (I'm not sure about=20 >>this) to get=20 >>some static IP address, over a VPN connection. >> >>Ivo >> >>----- Original Message -----=20 >>From: "Robert Schiffman" <[EMAIL PROTECTED]> >>To: <xmail@xmailserver.org> >>Sent: Thursday, April 26, 2007 3:24 PM >>Subject: [xmail] Re: Dynamic DNS >> >> >>> If you are on Verizon DSL they should also provide you with email >>> accounts. If this is so, you could use their mail server as=20 >>a gateway >>> for your mail server. I've done this in the past with a DSL=20 >>provider. >>> Edmonds, J.B. wrote: >>>> Excuse me if this is a worn out topic but until recently I=20 >>had no reason >>>> to follow this. >>>> I am a network admin for a 1500 member non-profit who has=20 >>run its own >>>> web and email server for over 10 years. We recently relocated to a >>>> Verizon area in the states that has only DSL available and=20 >>Static IP is >>>> NOT available. We decided to use DynDNS as our solution=20 >>and it works >>>> fine for web services. It works OK for email EXCEPT we=20 >>cannot deliver >>>> mail to AOL, Verizon, Comcast and Netzero customers, as=20 >>they apparently >>>> block dynamic address IP address ranges. >>>> >>>> If any of you have been, or are in this situation, can you=20 >>provide me >>>> some possible solutions. I have investigated relay via DynDNS and >>>> SMTPAUTH but they charge by the recipient and one newsletter >>>> distribution a month approaches the cost of having our=20 >>domain hosted by >>>> a commercial provider. I actually considered this option=20 >>until I see >>>> buried in the hosting sites and agreements a disclaimer=20 >>that they will >>>> not guarantee email delivery to AOL and Verizon. We have lots of >>>> members with AOL, Verizon, Comcast and Netzero accounts. >>>> >>>> The obvious solution is to move the server offsite but this=20 >>doubles the >>>> cost of service. Do you have experience with relay service=20 >>providers >>>> and recommendations? >>>> >>>> JB Edmonds >>>> >>>> >>>> >>>> - >>>> 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] >>>> >>>> >>>> >>>> >>>> >>> >>> --=20 >>> Robert Schiffman >>> Director of Technology >>> Lounge Lizard Worldwide, Inc. >>> 620 Johnson Ave. >>> Suite 1B >>> Bohemia, NY 11716 >>> 631-563-6165 ext. 21 >>> 631-563-6278 (fax) >>> Email: [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] >>>=20 >> >>- >>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] > - 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]
