Deliverability Reminders: Authentication
We're going to revisit authentication briefly today..
There are essentially 3 protocols that you need to be aware of.
1. SPF (Sender Policy Framework)
This allows a sender to verify their authenticity. This basically says that you're allowed to send email from your IP address on behalf of the sending domain. As part of your service, we make sure SPF is configured for your sending domain/IPs.
If you want to add SPF to your "from" domain(s), and you're sending through our system, not your own server, then simply add the following to your DNS for your from domain(s):
v=spf1 a mx include:embmailer.com -all
v=spf2.0/mfrom a mx include:embmailer.com -all
v=spf2.0/pra a mx include:embmailer.com -all
2. DKIM (DomainKeys Identified Mail)
This is newer authentication protocol (replaced domain keys) and is a bit more sophisticated. Without getting too technical, there's a "private" key and a "public" key... And in order for the message to "pass", both the private and public keys need to match.
The public key is available in the DNS records and any of the servers along the way can get the public key, decrypt the headers and verify the message is valid.
NOTE: The public can cannot ENCRYPT the headers. This is only possibly with the private key.
3. DMARC (Domain Message Authentication Reporting and Conformance)
This is the newest type of authentication.
DMARC basically says if SPF and DKIM are not correct, then don't deliver the message, mark it as quarantined, etc.
Because of DMARC, you should absolutely not send from free email providers (Gmail, Yahoo, Hotmail, etc.) Many marketers have, in the past, used their Gmail or Yahoo addresses, for example, as their "From Address". With DMARC, those messages will generally be rejected now.
For over a decade Heather Seitz used email marketing to build successful companies and had to solve the biggest barrier to consistent profitability: deliverability. Today, she is the Co-Founder and CEO of Email Delivered.
To know more about authentication, visit http://www.emaildelivered.com/deliverability-reminders-authentication/. Remember to sign up for the FREE Email Delivered Pulse newsletter for articles, tips, and recommended resources for email marketers.
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