Hi,
At this moment you can create a scheduled task which will resend the newsletters from queue. Anyway, I have added this as a feature suggestion to our product manage and I hope that some kind of setting will be available in one of the next version, so you will be able to limit the number of e-mails.
Regarding the hosting provider - I am not experienced in their services, but you can find list of our partners in
Hosting partners section of our web site.
Best Regards,
Juraj Ondrus