---
title: "Send Emails"
url: https://docs.catalyst.zoho.com/en/cloud-scale/help/mail/send-emails/
description: "Catalyst Mail enables you to send emails from your application by configuring your organization's email addresses of public or private domains, or the SMTP settings of any external email clients you prefer to use."
last_updated: 2025-12-18T19:12:06Z
service: Cloud Scale
type: general
---

# Send Emails

You can send emails from your Catalyst application after you configure the sender email address, and optionally the private domain and the SMTP server of the email client. The code templates for [Java](https://docs.catalyst.zoho.com/en/sdk/java/v1/cloud-scale/mail/send-email/), [Node.js](https://docs.catalyst.zoho.com/en/sdk/nodejs/v2/cloud-scale/mail/get-component-instance/) and [Python](https://docs.catalyst.zoho.com/en/sdk/python/v1/cloud-scale/mail/get-component-instance/) platforms, as well as the [API](https://docs.catalyst.zoho.com/en/api/code-reference/cloud-scale/mail/send-email/#SendEmail) specifications to send emails are mentioned in the respective help pages.

> **Note:** Ensure you verify your domain with Catalyst to send out emails using the Mail component. No emails can be sent without the verification being done. Attempting to send emails without proper [email](https://docs.catalyst.zoho.com/en/cloud-scale/help/mail/email-configuration/#verify-an-email-address) and [domain](https://docs.catalyst.zoho.com/en/cloud-scale/help/mail/domains/#verify-a-domain) verification will throw an  exception, and mail will not be sent.

Catalyst enables you to set multiple email addresses as the receivers, and to CC, BCC, and reply to, through a single send mail operation through the SDKs or the API. You can also attach files in the emails you send. The maximum supported limits for email recipients and file attachments in a single send mail operation are specified below:

* **To address:** 10
* **CC:** 10
* **BCC:** 5
* **Reply to:** 5
* **Number of file attachments:** 5
* **Size of file attachments:** 15 MB (through a single file or multiple files upto 5 files)