Jim Correia asked,
| If I am delivering mail using a pipe and dmail, should I always add the
| w flag? (If I don't, how does procmail determine if delivery was
| successful?)
Probably. Without the `w' or `W' flag, procmail will consider a pipe
successful so long as the command in it read the message text; procmail won't
care whether the command reported success or failure.
| If I use the f flag for a filter, is w implied?
No.
| If not, what are the
| circumstances in which a f(ilter) without w(aiting) is useful?
Few. If you don't care what output the filter gives when it reads the message
in properly but reports a failure as it exits, you don't need to wait.
Generally, unless the command is something with a lot of strange but safe
non-zero exit codes, you care about failure codes and want procmail to recover
the unfiltered text.
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