Or you might choose to
turn off SuperSafe when sending short-lived notification mail, or when your
queues are on a volatile filesystem, suchas an async or tempfs filesystem.
(RFC2824 recommends that you never turn off SuperSafe.) The HoldExpensive
option (?§24.9.55 on page 1036) tells sendmail to queue messages to ???expensive???
delivery agents (those with the F=e flag set, ?§20.8.23 on page 770) rather than
delivering them. If the queue is routinely filled with messages to expensive sites,
you should reconsider your reasons for marking those sites as expensive.
??? The queue can fill with messages because sendmail was run withth e -odq or -odd
command-line switch(see the DeliveryMode option, ?§24.9.35 on page 1004). At
sites that receive a great deal of UUCP mail for forwarding, the rmail(8) program
is often set up to run sendmail in ???queue-only??? mode withth e -odq
command-line switch. If UUCP mail is clogging your normal mail services, you
should consider queueing it to a separate queue directory. You can then process
that other directory with a separate queue run of sendmail. (Use of separate
queue directories is discussed in ?§11.9 on page 436.)
??? A slow machine can clog the queue. When a single machine is set up to handle
the bulk of a site??™s mail, that machine should be as swift as possible. In general, a
dedicated mail server should have a fast CPU with lots of memory.
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