Creating SPF record inside DNS server

Sender Policy Framework (SPF) is a type of DNS record created to help stop Spam. A lot of anti-spam filters include a filter to look for SPF records and if they are forged, block the messages. The easiest way to describe SPF is to call it a reverse MX record.

To create an SPF record on a Windows DNS server is pretty easy, and if you run BIND, its just as easy. Open up the DNS Management MMC and drill down to your Forward Lookup Zone. Right-click and select Other New Records.

From the list of available resource record types, select Text (TXT) and then click Create Record.

Enter the following text into the Text field:

v=spf1 a mx ip4:mail server ipaddress ~all

Click Ok when you are done and the SPF record will be created.

Now you might be asking what the hell that means :) Well........

• v=spf identifies the record as a SPF record
• MX specifies that all MX records can send from this domain
• -all SPF queries that do not match will fail, however depending on the recipients filtering rules, it may still get filtered.
• - ~all SPF queries that do not match will "soft fail" and depending on your rules may or may not get filtered

** Need to create A record on our DNS server for client host ip address to declare that client will be used this mail relay*** otherwise we can got relay access denied error if we didn't edit inside DNS server