Skip to content

SMTP Relay Configuration


The following are examples for setting up a SMTP Relay to relay outbound mails.

Community Guide

This guide was contributed by the Cloudron Community, and does not imply support, warranty. You should utilize them at your own risk. You should be familiar with technical tasks, ensure you have backups, and throughly test.


Zeptomail is a Transaction email service provided by Zoho, which offers a reliable and secure service that takes care of delivering these all-important transactional emails instantly, while you can focus on building your business.

  1. Navigate to your email settings in your Cloudron instance. You can do this by clicking on your username in the top left corner and clicking "email", or by going directly to: https://my.{server-url}/#/email

  2. Next, click on the domain you'd like configure, and the Outbound tab, or going directly to: https://my.{server-url}/#/email/{domain-name}/outbound

Create API Key

  1. Go to ZeptoMail Console
  2. Mail Agents > {mail-agent-name}
  3. Setup Info > SMTP > Send Mail API Token #

Cloudron Configuration

  • Select External SMTP Server
  • SMTP Host:
  • SMTP Port: 587
  • Username: emailapikey
  • Password: zeptomail-smtp-api-key