Description

When WordPress’s default sending doesn’t cover your email server setup, the SMTP Addon connects Newsletter to an external SMTP host, using details such as server, port, authentication, and encryption to send campaigns. This additional module is recommended for sites that need to centralize newsletters in the base plugin without relying only on WordPress’s native email function.

Main Features of the SMTP Addon

  • Sending via SMTP
    Forwards Newsletter campaigns through a configured SMTP server.
  • Server configuration
    Allows you to define host, port, and authentication credentials.
  • Encryption support
    Uses common security options for the connection to the server.
  • Newsletter integration
    Adds SMTP to the delivery flow of the base plugin.
  • Delivery control
    Replaces the default sending with a dedicated SMTP route.

Benefits of the SMTP Addon

  • More predictability
    Reduces dependence on WordPress’s native sending.
  • Centralized flow
    Keeps campaigns and delivery configuration in the same ecosystem.
  • Better traceability
    Makes it easier to review connection details used in sends.
  • Professional use
    Supports projects that work with lists and recurring campaigns.

Who Is the SMTP Addon Recommended For?

  • Administrators who use Newsletter for email marketing campaigns.
  • WordPress sites that need to send newsletters through their own SMTP server.
  • Agencies that set up sending routines for clients with active lists.

How to Download the SMTP Addon

The SMTP Addon is available for download on this page. To get it live, go to Plugins > Add New > Upload Plugin in the WordPress admin panel, upload the compressed file, and activate the addon. Then configure the SMTP details according to the server being used.

The SMTP Addon adds to Newsletter a delivery layer aimed at those who prefer to use a configured SMTP server instead of WordPress’s default sending. For projects with frequent campaigns, segmented lists, and the need for operational organization, the extension helps keep newsletter sending within a more controllable flow and compatible with professional environments.

Frequently asked questions

Is Newsletter SMTP Addon GPL-licensed?

Yes. Newsletter SMTP Addon is distributed under the GPL (GNU General Public License). You may legally use, modify and redistribute it on as many sites as you want.

Can I use Newsletter SMTP Addon on multiple sites?

Yes. You can install Newsletter SMTP Addon on as many sites as you want. Only automatic updates through Ultrapack Auto Updater have a limit: from 3 to 80 sites, depending on the plan.

How much does Newsletter SMTP Addon cost at Ultrapack?

Newsletter SMTP Addon costs US$2.99 as a single purchase, and it is also included in the subscription plans starting at US$12/mo (VIP I).

Does Newsletter SMTP Addon include updates?

Yes. The current version of Newsletter SMTP Addon is 1.2.6, published at Ultrapack on Aug 30, 2026. Subscribers update straight from the WordPress dashboard with UAU (Ultrapack Auto Updater).

Is Newsletter SMTP Addon scanned before publication?

Yes. Every version of Newsletter SMTP Addon goes through a malware scan (ClamAV and YARA rules, at UltraHub) before it is published.

What are the requirements for the plugin Newsletter SMTP Addon?

Requires WordPress 6.1 or higher and PHP 7.0 or higher. Tested up to WordPress 7.1.