Bug in mj_queueserv

Hi,

When you set $::CONCURRENCY down to 0 then you can't enqueue anything and 
it gets returned with a mailer error.

This is because, it appears, that the enqueuer tries to start up the queue 
server -- which doesn't allow for any runners.

The main good reason we like to be able to do this is in order to 
temporarily reduce system load by "effectively" turning off majordomo, w/o 
affecting all other mail systems -- and in fact still allowing it to 
enqueue jobs. Or, at least, that's what we had in mind.

I'd still like to see this allowed, but at a minimum, and in order to 
avoid bad behavior, I would recommend that the program test to see if 
$::CONCURRENCY is set to <1 and if so, default to 1.

Thanks,

-- 
Brock Rozen                                        [email protected]