I know this really isn't answering the question, but most consumer-grade Internet connections aren't ideal for running a server of the email variety. Assuming y

I know this really isn't answering the question, but most consumer-grade Internet connections aren't ideal for running a server of the email variety. Assuming you have a static IP, your ISP will likely block the standard SMTP/IMAP ports, requiring you to do additional configuration that may or may not work with different clients. Aside from the technical workarounds, your ISP may actually forbid you from doing this in their TOS. I agree with a3n that a VPS is the way to go.