In some circumstances, reading :include: lists can be slower than reading entries
from an aliases database. At busy sites or sites withnumerous mail messages
addressed to mailing lists, this difference in speed can become significant. Note that
the -bv command-line switch(?§6.7.15 on page 237) can be used with sendmail to
time and contrast the two different forms of lists. On the other hand, rebuilding the
aliases(5) database can sometimes be very slow. In suchinstances, the :include: file
can be faster because it doesn??™t require a rebuild each time it changes.
One possible common disadvantage to all types of mailing lists is that they are visible
to the outside world. This means that anyone in the world can send mail to a
local list that is intended for internal use. Many lists are intended for both internal
and external use. One such list might be one for discussion of the O??™Reilly Nutshell
Handbooks, called, say, nuts@oreilly.com. Anyone inside oreilly.com and anyone in
the outside world can send mail messages to this list, and those messages will be forwarded
to everyone on the nuts mailing list.
It is possible to protect your internal lists from use by outsiders, but doing so
requires writing custom rules. For possible rules you might be able to adapt for your
site??™s needs, see http://www.sendmail.org/~ca/email/examples/Internal.
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