Should that sendmail process
die or be killed halfway through processing, there is no record that the first half was delivered.
As a result, when the queue is later reprocessed, the recipients in that first half will
receive the message a second time.
The FastSplit option (?§24.9.50 on page 1032) and this CheckpointInterval option can
limit that duplication. The CheckpointInterval option tells sendmail to rewrite (checkpoint)
its qf file (which contains the list of recipients; see ?§11.2.5 on page 399) after each
group of a specified number of recipients has been delivered. Recipients who have already
received mail are deleted from the list, and that list is rewritten to the qf file. The forms of
the CheckpointInterval option are as follows:
O CheckpointInterval=num ?†? configuration file (V8.7 and later)
-OCheckpointInterval=num ?†? command line (V8.7 and later)
define(`confCHECKPOINT_INTERVAL??,`num??) ?†? mc configuration (V8.7 and later)
OCnum ?†? configuration file (deprecated)
-oCnum ?†? command line (deprecated)
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984 | Chapter 24: The O (Options) Configuration Command
The num argument is of type numeric and specifies the number of recipients in each group.
If num is entirely missing, is non-numeric, or is zero, this feature is disabled.
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