Name

${cert_md5}

Synopsis

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.

Get Sendmail, 3rd Edition now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.