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Deliverability – Email Authentication 101: What Do You Need To Know?

Deliverability – Email Authentication 101: What Do You Need To Know?




By: Deliverability

One of your primary goals is to ensure that your messages are getting to your target audience. One of the best ways to accomplish that is to comply with ISPs requirements by authenticating your email messages.

What is Email Authentication? Email authentication verifies the identity of the email senders and confirms that the email message is sent from the source that is stated as the sender of the message.

How is this information used by ISPs? Validating the identity of the email sender is important for ISPs to fight fraud and forgery. Email authentication simplifies and automates the process for ISPs to verify the identity of the email senders so they can eliminate fraud. If the email messages are not authenticated then ISPs are likely to reject these messages if they suspect spoofing or phishing.

What methods are used to authenticate email messages?

There are two methods of authentication:

  1. Sender ID and SPF
  2. Domain Keys and DKIM

Sender ID and SPF are IP based authentication methods. With this methodology, the sender specifies which IPs are permitted to send from a particular domain name. When an email sender requests a connection from the ISP, the ISP uses this methodology to verify that the IP address of the server that is deploying the messages has permission to send emails from the domain name that displays as the sender of the message.

Domain Keys and DKIM is a cryptographic based authentication. With this methodology, the sender of the message adds a digital signature (a key) in the header of the message that can only be verified by the ISPs. The ISPs look at the sending domain name and digital signature, and performs a DNS look-up to verify that the digital signature is authentic.




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  • Profile:  Jeff Ginsberg has 17+ years’ experience and is an industry known authority on email marketing who gets in the trenches with clients and helps them fulfill their marketing objectives, increase revenue and brand engagement. Clients rely on him and his team at The eMail Company to provide them with expertise from strategy to technology and from campaign management to channel integration. Jeff has worked with clients across all spectrums in the financial, automotive, retail and consumer packaged goods space. His experience covers both B2B and B2C markets. He has a strong background in educating and training agencies and clients about email best practices and is a wealth of knowledge when it comes to marketing tools and vendor selection. While Jeff’s team may be small, they know how to solve BIG email marketing problems. Looking for help with your next campaign? Don’t be afraid to give him a call – Jeff and his team ready to help you today. Give me a call: Toll Free: 877-We-eMail (877-933-6245) Local: 416-225-7711 eMail: jeff@theemailcompany.com
  • Website:  http://www.theemailguide.com
  • Twitter:   http://www.twitter.com/theemailguide
  • LinkedIn:   http://ca.linkedin.com/in/chiefemailofficer
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