Forum Solo ads Email send rate

I'd say it depends on some factors, but if you are aiming for the 'going fulltime' game, you are best off mailing daily (usually) :)

Like Demain said, it depends on many factors. Best way to figure this out is to build relationship with your subscribers. You will soon see if you are emailing too much, your unsubscribe rate will be high, if you are emailing to little, nobody will open your emails anymore...

It depends on how large your list is and how often they expect emails from you.