12 and later
The tls_server rule set is called at the start of any connection in which the local sendmail
would normally issue the STARTTLS SMTP command. The tls_client rule set is called at
the start of any inbound connection in which the STARTTLS SMTP command was offered.
Bothrule sets look up information in the access database. (See ?§5.3.8.2 on page 214 for a
full description of this process.)
The tls_server rule set prefixes its lookups witha literal TLS_Srv: expression, and the tls_
client rule set prefixes its lookups witha literal TLS_Clt: expression. Among the possible
returned values from the lookup can be two special keywords:
TLS_Srv:hostA.domain VERIFY
TLS_Clt:hostB.domain ENCR:bits
These two special keywords (VERIFY and ENCR) are not defined inside sendmail. Instead,
they are defined as values given to the class $={tls} (prior to V8.13) or $={Tls} (V8.13 and
later).
This class macro is properly defined in your default configuration file and should never
need adjustment.
22.6.14 $=s
Presume an RFC2822 7-bit body V8.7 and later
An email message as defined by RFC822 cannot contain 8-bit data. Consequently, when
the MIME Content-Type: header declares a message subtype that is rfc822, we immediately
know that it will contain nothing that needs 8- to 7-bit encoding:
Content-Type: message/rfc822
As other message subtypes evolve, this assumption can safely be made about them too.
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