One example is support for Kerberos V5, which is achieved using
GSSAPI.
KERBEROS_V4
The KERBEROS_V4 mechanism implements authentication based on MIT??™s
Kerberos 4.
PLAIN
The PLAIN mechanism can perform plain text password authentication (in a single
step) with either PAM, KERBEROS_V4, or /etc/passwd (or /etc/shadow) authentication.
LOGIN
The LOGIN mechanism is a two-step version of PLAIN.
The complete list of current mechanisms, and the RFC that describes each, can be found at
http://www.iana.org/assignments/sasl-mechanisms/ and http://www.sendmail.org/~ca/email/
mel/SASL_info.html.
The AuthMechanisms option is available only if sendmail is compiled withSASL (?§3.4.48 on
page 137) defined.
The AuthMechanisms option is not safe. If specified from the command line, it can cause
sendmail to relinquish its special privileges.
24.9.6 AuthOptions
Tune authentication parameters V8.10 and later
AuthOptions provides a list of general tuning parameters that affect authentication. It is
declared like this:
O AuthOptions=string ?†? configuration file (V8.10 and later)
-OAuthOptions=string ?†? configuration file (V8.10 and later)
define(`confAUTH_OPTIONS??, `string??) ?†? mc configuration (V8.10 and later)
The argument, of type string, is a list of characters selected from those shown in
Table 24-13, where each character sets a particular tuning parameter.
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