sendmail, 4th Edition

CACertPath

Directory with certificate authority certs V8.11 and later

STARTTLS and stream encryption are discussed in detail in STARTTLS on page 202. Among the items you must provide is a directory that contains the certificate of the authority for the server (ServerCertFile on page 1087) and client (ClientCertFile on page 984) as well as other certificates of authority you wish to trust. This directory contains both the certificates of authority and hashes of those certificates (more about this soon). The location of the CA certificate directory is specified with this CACertPath option, with declarations that look like this:

O CACertPath=dir                   ← configuration file (V8.12 and later)
-OCACertPath=dir                   ← command line (V8.12 and later)
define(`confCACERT_PATH',`dir')    ← mc configuration (V8.12 and later

Here, dir is a full path specification of the directory containing the CA certificate files and their hashes. The dir can contain sendmail macros, and if so, those macros will be expanded (their values used) when the configuration file, or command line, is read:

define(`confCACERT_PATH', `${MyCERTPath}')

The dir must be a full pathname (must begin with a slash), or the directory will be rejected and the following error logged:

STARTTLS=server: file dir unsafe: reason
STARTTLS=client: file dir unsafe: reason

Here, dir is the directory separately specified by the CACertPath option (CACertPath on page 982) and path is the file specified by this option. The num is the error number returned by the ...