ARC
ARC preserves an authentication information string when a message is transferred.
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BIMI
BIMI allows some couriers to display a brand logo associated with an authenticated domain.
View →DKIM
A cryptographic signature added to the emails to verify their integrity and origin declared.
View →DKIM Selector
A selector DKIM identifies the public key DNS used to verify a signature DKIM.
View →DMARC
A policy DNS which combines SPF and DKIM to combat the usurpation of email domains.
View →DMARC Alignment
Alignment DMARC checks that the domain visible in From corresponds to the domain authenticated by SPF or DKIM.
View →IMAP
A protocol that synchronizes emails and folders between a server and multiple devices.
View →MTA-STS
MTA-STS allows an area to require TLS for trade SMTP Compatible uphill.
View →MX Record
A record DNS which indicates which servers receive emails from a domain.
View →POP3
An old protocol that downloads emails from the server to a device.
View →SMTP
The protocol used to send and transfer emails.
View →SMTP AUTH
The mechanism by which a client authenticates to a server SMTP before sending messages.
View →SPF
A record DNS which indicates which servers are allowed to send emails for a domain.
View →SPF PermError
SPF PermError signals a permanent error making the policy SPF Impossible to assess correctly.
View →SPF SoftFail
SPF SoftFail Generally corresponds to the ~all mechanism and indicates that an unauthorized source should be treated with caution.
View →STARTTLS
A command to convert an initially unencrypted connection into a TLS-protected session.
View →TLS-RPT
TLS-RPT provides aggregated reports on TLS failures SMTP.
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