Zoho Mail can be accessed via IMAP or POP using SMTP. Log in to your webmail and Enable IMAP Access for your account before you configure IMAP in the email client. (You might require an Application-specific Password to set up the account for other devices if you have enabled Two-Factor Authentication). Find bellow Zoho IMAP, POP3 or SMTP settings.

Incoming Settings

The IMAP server is imap.zoho.eu and it is using the port 993. It requires SSL. 

The POP server is pop.zoho.eu and it is using the port 995. It requires SSL. 

Outgoing Settings

The outgoing SMTP server is smtp.zoho.eu, and it is using the ports 465 which requires SSL, and 587 that requires TLS.

Your email address is your username.

The step-by-step instruction sets for some of the popular IMAP clients are available in the links below.

Desktop Clients: Outlook  |  Thunderbird | Apple (Mac) Mail | Other IMAP Clients

Mobile Devices/ Tablets: Apple iPhone/iPad | Windows 7 Mobile |  Android (Samsung, Google Nexus etc) Other mobile IMAP Clients

source: ZOHO