domain v
Srv_Features: V
Here, we use the Try_TLS: prefix (?§5.3.8.4 on page 217) to prevent sending the STARTTLS
SMTP command to the host broken-host.domain. The second line (the first Srv_Features:
prefix) tells sendmail (the v) to request a client certificate during the TLS handshake only
for hosts in your.domain. The last line tells sendmail to not request a client certificate from
any other hosts.
Note that you can use the access database (?§7.5 on page 277) only if you enabled that database
with the FEATURE(access_db) in your mc configuration file.
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
711
Chapter 20 CHAPTER 20
The M (Mail Delivery Agent)
Configuration Command
Other than relaying mail via SMTP or LMTP, the sendmail program does not perform
the actual delivery of mail.* Instead, it calls other programs (called mail delivery
agents) to perform that service. Because the mechanics of delivery can vary so
widely from delivery agent to delivery agent, sendmail needs a great deal of information
about eachdelivery agent. Each sendmail M configuration command defines a
mail delivery agent and the information that sendmail needs.
20.1 The M Configuration Command
Like all sendmail.cf commands, the M mail delivery agent command must begin a line.
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