SMTP
The protocol used to send and transfer emails.
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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.
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