Limit swiftmailer emails per second in symfony2
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I am setting up SES to work with SMTP2. One of the limitations of SES accounts (atleast by default) is a 5 email per second limit.

I want to setup a spooler, as described in [this article][1]. I can use cron to trigger it every minute, which is fine for my purposes. My worry, though, is that a large number of emails will become queued in this spooler and my server will try to send them all at once.

The article lists a method for limiting the total emails sent each execution, as well as a wayt o limit the execution time. Neither fits my use case though: limiting emails sent per second.

Is there any way to limit the rate emails are sent from the spooler?
  [1]: http://symfony.com/doc/current/cookbook/email/spool.html