You can configure your Zoho Mail account on any standard IMAP client with the configuration details given below.
Incoming Server Settings (Organization users with a domain-based email address,you@yourdomain.com):
Incoming Server Name: imappro.zoho.com
Port: 993
Require SSL: Yes
Username: you@yourdomain.com
Outgoing Server Settings (Organization users with a domain-based email address, you@yourdomain.com):
Outgoing Server Name: smtppro.zoho.com
Port: 465 with SSL or
Port: 587 with TLS
Require Authentication: Yes
User Name: you@yourdomain.com.
Email Address: you@yourdomain.com.
Password: (You might require an Application-specific Password if Two-factor Authentication is enabled).
A huge mailbox with many folders can be cumbersome to view and synchronize emails in IMAP clients. To optimize your IMAP client's performance, you can choose the folders you want to synchronize with IMAP using the steps below:
When you delete an email or move it to another folder in your IMAP client, the email will be deleted or moved to another folder based on your IMAP settings. To make these changes immediately in your IMAP account, you can enable the 'Expunge Immediately' option with the steps below.
In case you have turned on Two-Factor Authentication for your account, you need to generate and use the Application-specific Password in the IMAP client you use.
In case you are a Federated Sign In user (Using Sign in using Google Apps/ Gmail/ Facebook etc), then you might not have an exclusive password in Zoho for your email account. Refer here for detailed instructions to generate a password for your account. You cannot 'Sign In' using your external account for POP/ IMAP/ Active Sync.