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Email authentication
Ensure the authenticity of an email message and protect against spam and phishing
SPF
The SPF mechanisms
What is SPF?
Why do we encourage using ~all over -all in an SPF record?
DKIM
What is a DKIM signature?
What is DKIM?
DMARC
How to format a DMARC record
What is BIMI?
What is DMARC?
Domain Reports
SSL / TLS
What is DANE?
What is SSL?
What is TLS?
What is STARTTLS?
The difference between TLS and STARTTLS
S/MIME
What is S/MIME?
PGP
What is PGP?