SMTP Server Configuration - Zoho Mail

 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.

Unable to connect to Outgoing Server/ SMTP Server

Sometimes, the email clients connect to the default port 25 when connecting to the SMTP server. In case of Zoho Mail, you need to connect to smtp.zoho.com in SSL or TLS ports i.e 465 or 587 respectively. Ex: In Outlook, you need to check the 'Advanced Server Settings' section. 

If the port details are correct and there are still issues in connecting to the server, you need to get the traceroute details for smtp.zoho.com server and share it to support (at) zohomail (dot) com with the details of your account, your email client, screenshots of the configuration, etc.

Authentication Failure

When configuring SMTP/ Outgoing Server, you need to provide the entire email address and the correct password for authentication. 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

If you forward 'Calendar Events' directly from Outlook, Outlook tries to send it with the From address as Organizer's email address. In this case, you will see the 'Relaying Disallowed' error.

The invitation cannot be directly forwarded because of the email address mismatch when you send the invite. As a workaround, you can right-click the event and select 'Forward as Attachment' to send the event invitation.