Category: Authentication
Why did my email messages to Gmail receive a “421 4.7.30 This mail has been rate limited because DKIM does not pass. Gmail requires all large senders to authenticate with DKIM. Authentication results: DKIM = did not pass” message?
Starting on February 1, 2024, Google has imposed new requirements on bulk senders, including a…
What is DKIM?
DKIM, short for Domain Keys Identified Mail, is an email authentication technology used to help…
What is SPF?
It’s not Sun Protection Factor, SPF stands for Sender Protection Framework. SPF is one of…