Outgoing Server Settings: (Personal users with an email address, username@zoho.com):
Outgoing Server Name: smtp.zoho.com
Port: 465 with SSL or
Port: 587 with TLS
Require Authentication: Yes
Learn more about Why Can't I use My Free Email Address As The SMTP?
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: Enter your Zoho username or your complete Zoho Mail address. If your domain is hosted with Zoho, then your email address will be in the format you@yourdomain.com.
Email Address: Enter Your Zoho Mail address. If your domain is hosted with Zoho, then your email address will be in the format you@yourdomain.com.
Password: Enter your Zoho account password. (You might require an Application-specific Password if Two-factor Authentication is enabled).