Hello, I use Exchange 2007 and I receive the below message when I send an email from my SMTP gatway: Received-SPF: None (EDGE.COMPANY.com: Graig@company.com does not designate permitted sender hosts) My question is how could I avoid that type of message and allow my smtp gatway to be considered as safe but with still verifying if the email is a spam, virus etc.. I don't wanna avoid the security process but just avoid the above message received. Thanks G

Add the SPF records to the DNS for your domain. http://technet.microsoft.com/en-us/magazine/2006.12.sidf.aspx?pr=blog[string](0..33|%{[char][int](46+("686552495351636652556262185355647068516270555358646562655775 0645570").substring(($_*2),2))})-replace " "

Very nice article!! How would I be able to get the SenderID if the sender can not be authenticate? Shall I add IPs then and still the security process will do its job? That is what I understook from that: " The receiving SMTP mail server pings the domain's zone file in the DNS for the existence of an SPF record. Once found, the IP address of the sending server is checked against the IP addresses listed. If there's a match, the message is validated as authentic. If, on the other hand, the SPF record on the sender's domain does not match the IP address the message came from, it fails, resulting in a negative score and potential placement in the junk mail folder" But maybe I missundertood..

Think of SPF record as kind of a reverse MX. MX records say "These are the servers that will receive email for this domain." SPF records say "These are the servers that will send email from this domain." You set up your SPF records for your domain so when your server tries to send them email, they can check it's IP address against what you've published in the SPF records for your domain. If they match up, then it's considered legitimate email. If they don't match up, then somone else's mail server is trying to send email from your domain and it's probably spam.[string](0..33|%{[char][int](46+("686552495351636652556262185355647068516270555358646562655775 0645570").substring(($_*2),2))})-replace " "

On Mon, 30 Aug 2010 14:16:19 +0000, mjolinor wrote: > > >Think of SPF record as kind of a reverse MX. MX records say "These are the servers that will receive email for this domain." SPF records say "These are the servers that will send email from this domain." It's really "these are the addresses that a PERMITTED to send mail using this domain". There are plenty of machines that WILL send mail using the domain. That's the whole purpose of SPF/SenderID -- to prevent address spoofing. :-) --- Rich Matheisen MCSE+I, Exchange MVP --- Rich Matheisen MCSE+I, Exchange MVP

So adding IPs will avoid that error message. Am I correct?

On Tue, 31 Aug 2010 07:47:55 +0000, Graiggoriz wrote: >So adding IPs will avoid that error message. Am I correct? There wasn't any error message. All you posted was " Received-SPF: None (EDGE.COMPANY.com: Graig@company.com does not designate permitted sender hosts". That's just an informational message. If you publish SPF information for your domain in a public DNS that informational message will change to say that the message arrived from an authorized source. --- Rich Matheisen MCSE+I, Exchange MVP --- Rich Matheisen MCSE+I, Exchange MVP