I have signed up and so far so good.

I have 2 questions:

1. I read the pinned topic about domain payment. I transfered my domain. If I read correctly, after I made the changes to the DNS it will take about three days to start using this host instead of my old one?

2. What ports does email use?

1. Correct.
2. Thay are usual. SMTP: 25, POP: 110