What is SPF and SenderID?

Knowledge Level:
Time: 10 minutes
Suggested Skills: Email Deliverability, Network
Objective: The easiest way to make sure your message is authenticated to improve deliverability to the inbox is to have your network administrator update your organization's SPF record. For more information on SPF and SenderID, keep reading! 


SPF/SenderID info:

SPF/SenderID Records Lookup for a Domain:


SPF looks at the domain in the Return-Path header.

This is always @emailcampaigns.net. Looking up @emailcampaigns.net on http://www.kitterman.com/spf/validate.html gives:

v=spf1 include: emailcampaigns.net

This says all of those IP's are allowed to send for @emailcampaigns.net.  We have the records, so SPF will always pass for any email mail2 sends.

Sender-ID looks at the "Purported Responsible Address".

This boils down to the "From:" header or the "Sender:" header. mail2 does provide an option to "Authenticate This Message" which adds the "Sender:" header with a value of

"fromemail= fromdomaincom@emailcampaigns.net"

This ensures the Sender-ID checks will pass. The side effect is that it creates the "on behalf of" in some email clients.

If you'd want to avoid this, you could add our emailcampaigns.net SPF record for the domain of the "From:" header. This will then pass SenderID checks without using the "Authenticate This Message" option. To do do this add the following to your domain's SPF record:

include: emailcampaigns.net

This makes sure that emailcampaigns.net is recognized as a valid sender on your network for your domain, and you no longer need to check the "Authenticate this email" box in the campaign creation process. 

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