Custom SMTP

Connect any SMTP server to Enbbox for email delivery. Custom SMTP integration with host, port, authentication, and TLS configuration.

Overview

The Custom SMTP integration lets you connect any SMTP-compatible email server — including Gmail, Zoho, your own mail server, or any other provider that supports SMTP.

Step 1: Gather SMTP Settings

You'll need these from your email provider:

Setting	Example
SMTP Host	`smtp.gmail.com`
SMTP Port	`587` (TLS) or `465` (SSL)
Username	`[email protected]`
Password	App-specific password or SMTP password
Encryption	TLS (recommended) or SSL

Common SMTP Settings

Provider	Host	Port
Gmail	`smtp.gmail.com`	587
Outlook/Hotmail	`smtp.office365.com`	587
Yahoo	`smtp.mail.yahoo.com`	587
Zoho	`smtp.zoho.com`	587

[!WARNING] For Gmail, you must use an App Password (not your regular password). Go to myaccount.google.com/apppasswords to generate one. Requires 2-Factor Authentication to be enabled.

Step 2: Connect to Enbbox

Navigate to Integrations in the Enbbox dashboard
Click Add Provider → select Email → Custom SMTP
Enter:
- SMTP Host
- SMTP Port
- Username (optional — some servers allow unauthenticated relay)
- Password
- From Email
- Sender Name
- TLS/SSL setting
Click Test Connection to verify
Activate the integration

Step 3: Send a Test Email

Create a workflow with an Email step and trigger it to verify delivery.

Troubleshooting

Issue	Solution
Connection refused	Check host, port, and firewall rules
Authentication failed	Verify username/password; use App Passwords for Gmail
TLS handshake failure	Try port 465 with SSL instead of 587 with STARTTLS
Emails go to spam	Set up SPF, DKIM, and DMARC records for your domain
Rate limited	SMTP servers have sending limits — consider a dedicated email provider for high volumes