The SMTP Addon for The Newsletter Plugin (often referred to as the TNP SMTP Extension) is a specialized tool designed to improve email deliverability. Unlike generic SMTP plugins, this specific addon is tailored to work exclusively with the newsletters and service messages generated by the main plugin.
This is EXACTLY the same product as distributed by the developer. Sales Page
Developer: The Newsletter Team (Official Addon)
Version: 1.1.7 (as of late 2025/early 2026)
License: Usually available for free (or bundled with professional plans)
Compatibility: Requires The Newsletter Plugin (Core) to be installed.
Scope: Only handles emails sent by the Newsletter plugin (newsletters, welcome emails, activation links). It does not override standard WordPress emails (like password resets or WooCommerce notifications).
The addon allows you to bypass your web host’s internal mail server (which often has low limits and poor deliverability) by connecting to a professional SMTP service.
| Feature | Description |
| Custom SMTP Fields | Configure Host, Port, Username, and Password. |
| Security Support | Supports SSL and TLS encryption protocols. |
| Insecure SSL Bypass | Option to ignore certificate errors for older or misconfigured servers. |
| From Name/Email | Allows you to force a specific “From” address to match your authenticated domain. |
| Test Tool | Integrated testing interface to verify the connection before sending a live campaign. |
| Error Logging | Detailed logs for troubleshooting “connect() failed” or authentication errors. |
To use this addon effectively, you generally need the following:
PHP Version: 7.0 or higher (7.4+ recommended).
WordPress Version: 6.1 or higher.
SMTP Credentials: An account with a provider such as Amazon SES, Mailgun, SendGrid, Brevo (formerly Sendinblue), or even a dedicated mailbox from your own hosting provider.
DNS Authentication: While the addon handles the connection, you must still configure SPF, DKIM, and DMARC on your domain’s DNS to ensure the highest delivery rates.
