Deliverability – Email Authentication 101: What Do You Need To Know?
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:
- Sender ID and SPF
- 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.
Want to check out the who’s who and what’s what of email marketing?
Read The Buzz.
Other post by this Author