Tag: Authentication
Why Did My Messages to Gmail Bounce With Error 550, “5.7.26”, “This message does not have authentication information or fails to pass authentication checks (SPF or DKIM)”?
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…