Throttler Plugin
If your SMTP server has restrictions in place to limit the rate at which you send emails, then your code will need to be aware of this rate-limiting. The Throttler plugin makes Swift Mailer run at a rate-limited speed.
Many shared hosts don't open their SMTP servers as a free-for-all. Usually they have policies in place (probably to discourage spammers) that only allow you to send a fixed number of emails per-hour/day.
The Throttler plugin supports two modes of rate-limiting and with each, you will need to do that math to figure out the values you want. The plugin can limit based on the number of emails per minute, or the number of bytes-transferred per-minute.
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Using the Throttler Plugin
The Throttler Plugin – like all plugins – is added with the Mailer class' registerPlugin() method. It has two required constructor parameters that tell it how to do its rate-limiting.