The account supports connecting to IMAP using account/password or refresh token. The IMAP address is: imap.zmailservice.com

Login Methods
1. Use Email & Password (Plain Auth, No refresh token needed)
IMAP Address:  
imap.zmailservice.com
Port: 993 (SSL/TLS)
or
Port: 143 (No SSL/TLS)
2. Use Refresh Token (OAuth2 Login)
POP3 example code
IMAP example code