Assume your website is www.mysite.com and your public email name is myself@mysite.com. You have been assigned the 5th mailbox at this site (e.g., mystcm5)

1st Choice: IMAP (leaving mail on server so it can be read by multiple devices also only pulls the TO, FROM, and SUBJECT down)  or POP3 (normally pulls all the email down to the device)

If you want to view your mail on a phone but keep records on the desktop/laptop set the desktop/laptop to POP3 and the phone to IMAP. 

Whenever you use IMAP remember to empty your trash. 

For all:
Email Address: myself@mysite.com
Username/name on server: mystcm5
Password: change via www.mysite/cgi-bin/managemail/adminhome.pl

For secure transmission: Recommended
Incoming Mail Server: mysite.com
Incoming Mail Server Port: 993 for IMAP or 995 for pop3
Outgoing Mail Server: mysite.com
Outgoing Mail Server Port: 587
Select: Use SSL for incoming server and TLS  for outgoing server

For open transmisions
Incoming Mail Server: mysite.com
Incoming Mail Server Port: 110 for pop3 or 143 for IMAP
Outgoing Mail Server: mysite.com
Outgoing Mail Server Port: 587
Disable: SSL and TLS for both incoming and outgoing severs.