${cert_md5}
MD5 of cert certificate V8.11 and later
As a part of the STARTTLS form of authentication and
encryption, certificates are usually exchanged. This
${cert_md5}
macro is assigned the result of an
md5(1) 128-bit “fingerprint”
of the certificate presented by the other side. That
value might look like this:
5e5bb09c1a3488a3216aaabe23081caf
The ${cert_md5}
macro is not used in the default configuration file,
but is available for use in rule sets of your own
design. Note that a $& prefix is necessary when you
reference this macro in rules (that is, use $&{cert_md5}, not
${cert_md5}).
${cert_md5} is
transient. If defined in the configuration file or
in the command line, that definition can be ignored
by sendmail.
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