Email Authentication Part One: Introduction

Posted by bkloss | Email Deliverabilty | Friday 22 February 2008 9:44 pm

A common misconception exists about email deliverability. When asked why an email is blocked or junked, many people will respond that the content of the email was considered spammy. Although spam filters do block and bulk email, for content that uses words common to spam, email authentication factors into an ISPs decision to deliver mail. ZDNet defines email authentication as:

“The verification that an e-mail message has been sent by the domain name in the From field. Called “domain spoofing,” spammers falsify the From address in their messages in order not to be identified. SPF Classic, Sender ID and DomainKeys are authentication methods that are expected to proliferate. They all rely on DNS records, either to obtain sending mail server addresses or public keys for decrypting a digital signature. See Sender ID, DomainKeys and SPF.”

Confused yet?