5.6. More Notes on Mass Mailing
When using a message injector, this procedure can carefully track the success and failure of each message being sent, and can regenerate a given message if a catastrophe occurs. In this case, and probably only in this case, it wouldn’t be unreasonable to turn the SuperSafe option off, so fsync()s won’t occur and I/O would be sped up considerably. If SuperSafe is set to False, one must be able to detect and be willing to reconstruct incomplete message deliveries at the time of a server crash; in most cases, then, it’s easier to keep SuperSafe on or set to interactive. This is especially true if the relay server runs 8.12 in interactive delivery mode, where most of those writes won’t occur anyway.
It’s obvious that ...
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