A line can be split into two or
more pieces. For example, consider the following text from the body of a mail message:
The maximum line length for SMTP mail is 990 characters.
A delivery agent speaks SMTP when the $u sendmail macro
is omitted from the A= equate.
A delivery agent could limit line length to 20 characters with a declaration of:
L=20
With that limit, the preceding text would be split during transmission into the following
lines:
The maximum line len!
gth for SMTP mail is!
990 characters.
A delivery agent spe!
aks SMTP when the $u!
sendmail macro
is omitted from the !
A= equate.
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
746 | Chapter 20: The M (Mail Delivery Agent) Configuration Command
Limiting the line length can be useful for programs that can??™t handle long lines, such as a
40-character Braille print-driving program. (But such conversions to shorter lines are probably
best left to the specialty delivery agent.)
If the argument to L= is missing or if it evaluates to 0 or less, the maximum line limit is
internally set to zero, in which case no limit is enforced.
In using V8 sendmail??™s mc configuration, the default for the smtp, dsmtp, esmtp, and smtp8
delivery agents is 990. The default for the relay delivery agent is 2040.
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