feedmail-queue-runner-is-active

feedmail-queue-runner-is-active is a variable defined in `feedmail.el'.
Its value is

nil

Documentation:
Non-nil means we're inside the logic of the queue-running loop.
That is, iterating over all messages in the queue to send them. In
that case, the value is the name of the queued message file currently
being processed. This can be used for differentiating customized code
for different scenarios. Users shouldn't set or change this
variable, but may depend on its value as described here.