This plugin hasn’t been tested with the latest three major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.

Surbma | SMTP


This plugin is created especially for Multisite Networks. You can define all variables in the wp-config.php file and it will be valid for all sites in a Multisite. So this is not for a site-by-site configuration plugin. You can install it on a single WordPress install also and it will work perfectly. But if you install it in a Multisite Network, you can only network activate it!

This plugin is working with all SMTP servers and services, like Mailgun, SendGrid, Mandrill, Amazon SES and others.

Required variables:

  • SURBMA_SMTP_HOST – External SMTP server.
  • SURBMA_SMTP_USER – User for the SMTP account.
  • SURBMA_SMTP_PASSWORD – Password for the SMTP account.

Optional variables:

  • SURBMA_SMTP_PORT – Port number for the SMTP server.
  • SURBMA_SMTP_SECURE – Choose SSL or TLS, if necessary for your SMTP server.
  • SURBMA_SMTP_FROM – From email address for all outgoing emails.
  • SURBMA_SMTP_FROMNAME – From name for all outgoing emails.

Example configuration:


You can put these lines everywhere before the line, that says: “That’s It. Pencils down”

Do you want to contribute or help improving this plugin?

You can find it on GitHub:

You can find my other plugins and projects on GitHub:

Please feel free to contribute, help or recommend any new features for my plugins, themes and other projects.

Do you want to know more about me?

Visit my webpage:


  1. Upload surbma-smtp folder to the /wp-content/plugins/ directory
  2. Activate the Surbma – SMTP plugin through the ‘Plugins’ menu in WordPress
  3. Set every global variable in the wp-config.php file.
  4. That’s it. 🙂


What does Surbma mean?

It is the reverse version of my last name. 😉


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Contributors and Developers

“Surbma | SMTP” is open source software. The following people have contributed to this plugin.


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Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.

Change Log


Release date: 2019-07-02

  • Minor changes in title and description.
  • Tested up to WordPress 5.2 version.


  • Minor change in description.


  • Simple versioning.
  • Minor code optimizations.
  • Tested up to WordPress 4.9 version.
  • Tested with PHP 7.2 version.


  • Allow only network activation in Multisite Networks.
  • Added detailed description.


  • Initial release.