Skip to main content
Send transactional emails into Sequenzy via SMTP instead of the REST API. This is useful for applications that already have SMTP integration (Laravel, WordPress, legacy systems) or prefer the standard email protocol.
This page describes SMTP submission to Sequenzy: your application connects to smtp.sequenzy.com, then Sequenzy handles outbound delivery. Sequenzy does not support customer-managed outbound SMTP relays: outbound delivery remains Sequenzy-managed through SES or Sequenzy’s MTA. You cannot configure Hostinger or another mailbox provider as the delivery transport for campaigns, sequences, or transactional sends.
You can still use a mailbox or alias hosted by Hostinger or another provider as the visible From address after verifying its domain in Sequenzy, and as the Reply-To address for manual replies. Your existing mailbox hosting can remain unchanged.

SMTP Credentials

Use these credentials to configure your application:
The username can be anything—only the password (your API key) is used for authentication. We recommend api for clarity.
SMTP requires a company API key with the transactional:send permission. Full-access keys and keys created with the transactional_sender preset both work. Personal keys and keys without that permission are rejected at login.

Port Options

Sequenzy supports multiple ports for different network environments:

Which port should I use?

  • Port 587 is the standard for email submission and works with most applications
  • Port 465 is for legacy applications that require implicit TLS (connect with SSL from the start)
  • Port 2525 is useful if your ISP or firewall blocks standard SMTP ports. It uses STARTTLS just like port 587.

Prerequisites

Before sending via SMTP:
  1. Create an API key in the Sequenzy dashboard. Go to Settings → SMTP to view your connection details and generate the key (it doubles as your SMTP password) in one click, or manage keys under Settings → API Keys
  2. Verify your domain in Settings → Domains
  3. Configure a sender profile with the email address you’ll send from

Quick Start

Framework Integrations

Laravel

Update your .env file:
Then send emails using Laravel’s Mail facade:

Django

Update your settings.py:
Then send emails:

Ruby on Rails

Update config/environments/production.rb:

WordPress

Install a plugin like WP Mail SMTP and configure:
  • SMTP Host: smtp.sequenzy.com
  • Encryption: TLS
  • SMTP Port: 587
  • SMTP Username: api
  • SMTP Password: Your API key

Features

Same Pipeline as REST API

SMTP emails go through the same processing pipeline:
  • Analytics: All emails appear in your Sent Emails dashboard
  • Tracking: Opens and clicks are tracked (if enabled)
  • Branding: Footer added for free tier accounts
  • Rate limits: Same limits apply as REST API

Security Enforcement

The SMTP server applies the same security checks:

Message Limits

Rate Limits

Troubleshooting

Your ISP or firewall may be blocking SMTP ports. Try port 2525 instead of 587.
  • Ensure you’re using a valid API key as the password
  • The API key should start with ek_
  • Check that the key hasn’t been revoked in your dashboard
The sender domain (the domain in your From address) must be verified in Settings → Domains before you can send.
The recipient email may be on the bounce list. Check your Sent Emails dashboard for previous bounces to this address.
You’ve exceeded 100 emails/minute. Wait a minute and try again, or contact support to increase your limit.

FAQ

Yes, the username is ignored—only the password (your API key) is used for authentication. We recommend using api for clarity.
Yes, all emails sent via SMTP appear in your Sent Emails dashboard with full analytics, same as REST API emails.
Yes, if tracking is enabled for your account. SMTP emails use the same tracking pixel and link rewriting as REST API emails.
Yes, standard MIME attachments work. Maximum total message size is 25MB.
  • Port 587 (STARTTLS): Starts unencrypted, then upgrades to TLS. This is the modern standard.
  • Port 465 (Implicit TLS): Encrypted from the start. This is a legacy method but still supported.
Use port 587 unless your application specifically requires implicit TLS.
Some ISPs and corporate firewalls block standard SMTP ports (25, 587, 465). Port 2525 is an alternative that’s less likely to be blocked and still uses STARTTLS like port 587.
SMTP is designed for transactional emails. For bulk marketing campaigns, use the Campaign feature in the dashboard or REST API.