First off, thanks for this amazing module! Will definitely donate once my online store takes off

2ndly I have a question. This is kinda an email related questions. I use gmail, even though I can get an email with my domain name. I know gmail has a limit of how many emails you can send, so lets say one day I sent a newsletter to people and on that same day I get 10 orders. Will some of my emails not come to my inbox? I am not using the SMTP setting, I am using the default one?

Can you please give some recommendations. The only reason I ask is because one time I sent more then 500 emails(in the 2 bar) using gmail web broswer and a lot of the mail got blocked as spam.