I have the following image of your setup:
collector (mod_perl) -> MySQL -> sender (LWP?)
If your clients support HTTP/1.1, it might be worthwhile to use the LWP::ConnCache in your sender, so you don't have to reopen the connection to your client(s) on every new message. I don't know if Apache has a built-in method for connecting/sending via sockets - if it has, using that mechanism or fudging it into LWP::ConnCache might speed up the process a lot. You maybe should make the sender into different processes that (all) poll the database for new messages as soon as they've sent the current batch of messages - this will generate a lot of load on the database, but you can easily decouple the reception and sending of the messages that way.
Other than that, I don't really see much of a better way, as you have already decoupled your system and use a versatile scheduling mechanism, the database... You could try to separate the system further by putting the database and sender onto two different machines, or better on a 4 CPU machine, so you have three CPUs, enough RAM and enough network capability to keep all parts saturated.
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