Do automatic emails get sent to those input via CSV?

Hi all - quick question!

So if I set up an automatic email to go out when people join my mailing list - if I input addresses to this mailing list via CSV, do they get sent the automatic email as soon as I input them? Or do they only get the automatic email if they sign up manually themselves on the website. 

Also do the automatic email campaigns count towards any limits? (Is there a limit to how many automatic emails can go out per month? For example, if I add 200 people by CSV per day would that be an issue, or are automatic campaigns infinite?)

Many thanks!