What happens when a user from eample ISP has to use their IPS's mail server because they block port 25, But the user is sending from their Hotmail, or MSN mail address? .
Robert Whitaker The Modem Pool 517-789-5689 1-888-377-5689 Be sure to try the New Web Express Internet Accelerator from The Modem Pool http://web-express.modempool.com They want to send mail using their ----- Original Message ----- From: R. Scott Perry <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, October 05, 2004 5:40 PM Subject: Re: [Declude.JunkMail] confusion on SPF and IP addresses > > >There is one point about the setup of SPF records in DNS that confuses me: > >SPF compares the return address of email against the IP of the MX record for > >that domain. However, the MX record doesn't point to an IP, it points to a > >host name, which may be in another domain. So the MX record for abc.com may > >point to mail.xyz.com. So when systems do an SPF lookup, do they just find > >the IP of mail.xyz.com and use that, and ignore the fact that that mail > >server really belongs to another domain? > > Correct. SPF doesn't care about any domains, except the domain of the > sender. So if the sender is [EMAIL PROTECTED], and the MX record for abc.com is > mail.xyz.com, then SPF will check to see if the IP address that the E-mail > is being sent from is in the A record of mail.xyz.com. In other words, if > the E-mail is really being sent from mail.xyz.com, it will pass SPF. > > -Scott > --- > Declude JunkMail: The advanced anti-spam solution for IMail mailservers > since 2000. > Declude Virus: Ultra reliable virus detection and the leader in mailserver > vulnerability detection. > Find out what you've been missing: Ask for a free 30-day evaluation. > > --- > [This E-mail was scanned for viruses by Declude Virus (http://www.declude.com)] > > --- > This E-mail came from the Declude.JunkMail mailing list. To > unsubscribe, just send an E-mail to [EMAIL PROTECTED], and > type "unsubscribe Declude.JunkMail". The archives can be found > at http://www.mail-archive.com. > --- [This E-mail was scanned for viruses by Declude Virus (http://www.declude.com)] --- This E-mail came from the Declude.JunkMail mailing list. To unsubscribe, just send an E-mail to [EMAIL PROTECTED], and type "unsubscribe Declude.JunkMail". The archives can be found at http://www.mail-archive.com.
