If more than one character
is listed, each character must be separated from the next by either a comma or a space.
Table 24-13. AuthOptions character settings
Character Meaning
A Use the AUTH= parameter from the MAIL From: command only when authentication succeeds. This character
can be specified as a workaround for broken MTAs that do not correctly implement RFC2554. (Client only)
a Provide protection from active (nondictionary) attacks during the authentication exchange. (Server only)
c Allow only selected mechanisms (those that can pass client credentials) to be used with client credentials.
(Server only)
d Don??™t permit use of mechanisms that are susceptible to passive dictionary attacks. (Server only)
f Require forward-secrecy between sessions (where breaking one won??™t help break the next). (Server only)
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
978 | Chapter 24: The O (Options) Configuration Command
If string is missing, sendmail will issue the following error and skip this option declaration:
Warning: Option: AuthOptions requires parameter(s)
If any letter is specified other than those listed in the table??”for example, H??”sendmail
issues the following warning and skips this option declaration:
Warning: Option: AuthOptions unknown parameter 'H'
Note that macros cannot be used to define the list of characters.
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