Zoho Mail - SMTP Server Configuration

 SMTP - Simple Mail Transfer Protocol

SMTP or Simple Mail Transfer Protocol allows you to send emails from an email application through a specific server. For example, if you want to use your Zoho Mail account to send email through another email client, you will need to configure the settings in that client with Zoho's SMTP information.

 SMTP Configuration settings for Zoho Mail - SSL

Outgoing Server Name: smtp.zoho.com
Port: 465
Security Type: SSL 

Require Authentication: Yes. 

The email address should match the email address/ aliases of the account, for which the authentication details are provided. 

 SMTP Configuration settings for Zoho Mail - TLS

Outgoing Server Name: smtp.zoho.com
Port: 587
Security Type: TLS 

Require Authentication: Yes. 

The email address should match the email address/ aliases of the account, for which the authentication details are provided. 

You may require an Application-specific Password to set up the account in other devices if you've enabled Two-Factor Authentication.

 Relaying disallowed error

When the email address (or login credentials) you have provided in the application does not match the email address (or credentials) of your account's outgoing server, you will see a 'Relaying Disallowed' error when you attempt to send an email. The SMTP client will not be able to send the email because of the email address mismatch. 

This can happen when an email address is used as default in a coded program or when you have misspelled the email address while configuring your email inbox. You will receive emails without any issues. To resolve the 'Relaying Disallowed' error, you need to correct the email address provided. 

Relaying disallowed error while using Outlook Calendar and Mail

You will see the 'Relaying Disallowed' error when you forward calendar events directly from Outlook. The invitation from the event organizer's email address will not be sent because of the email address mismatch. As a workaround, you can right-click the event and select 'Forward as Attachment' to send the event invitation.