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qmail-queue and qmail-send communicate via a named pipe called /var/qmail/queue/lock/trigger. If this pipe gets messed up, qmail-send doesn't notice new messages for up to 25 minutes.
The best way to ensure that trigger is set up right is to run make check from the source directory. If that's not possible, make sure it looks like this:
# ls -l /var/qmail/queue/lock/trigger prw-w-w- 1 qmails qmail 0 Jul 5 21:25 /var/qmail/queue/lock/trigger #
Pay particular attention to the p at the beginning of the line, which says that it's a named pipe, the mode (must be world-writable), the owner, and the group.
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