Question

You're setting up a secure email server on your local network that you want clients to be able to access from the Internet using IMAP4 and SMTP. Which ports should you open in your firewall?

Answer 1

Answer:

587 and 993.

Explanation:

When the user uses those things to configure a protected mail within the following local servers, he needs the customers to still be allowed to connect from that of the Internet. Thus his firewall must have the following ports accessible that is 587 and 993 because these ports are only accessible by his firewall.