Heroku supports working employees with DelayedJob. Workers are located in the same way as Dynos (you pay by the hour), and for this you get a dedicated resource for processing your letters.
In the past, I used Cron, the calling controller in my application. It is quite effective.
If the hourly limit is a problem, you can call your application from another place ... I have a cheap Dreamhost account for some of my non-priority sites that I used as Cron systems.
There are also many ping and uptime services that you can use for this purpose ... just transfer these services to your email controller.
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