Plugin Directory

Custom SMTP: Email Deliverability – FREE & Easy-to-use

Custom SMTP: Email Deliverability – FREE & Easy-to-use


Add Mail SMTP settings for WordPress

Looking to modify the SMTP on your WordPress site?
Our Custom SMTP solution offers you this possibility, allowing you to easily change your WordPress SMTP settings, ensuring your emails consistently land in the recipient’s inbox.

Custom SMTP solves your email deliverability problems by reconfiguring WordPress to use a proper SMTP provider when sending emails.

What’s more, our intuitive settings page and comprehensive documentation will guide you through the process, making the task of modifying your SMTP settings easier than ever.

Custom SMTP is a free tool, packed with all the essential features you need to send your WordPress emails with absolute confidence!


  1. Install Custom SMTP by WPForms either via the WordPress.org plugin repository or by uploading the files to your server.
  2. Navigate to the Settings > Custom SMTP in the WordPress admin.
  3. Edit the settings using your chosen SMTP option (SMTP.com, Brevo (formerly Sendinblue), Mailgun SMTP, SendGrid SMTP, Postmark, SparkPost, Gmail SMTP, or Other SMTP) and adhere to the instructions for configuration.

1, 2, 3: You’re done!


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Contributors & Developers

“Custom SMTP: Email Deliverability – FREE & Easy-to-use” is open source software. The following people have contributed to this plugin.




Release Date – July 5, 2024

* Improved security of saved options with appropriate validation and sanitization.
* Code optimization by removing unused code comments and adding value checks before use.
* Split the main custom-smtp.php file into several files to improve maintainability and readability.
* Creation of includes/admin, includes/smtp and includes/utils folders to organize code by functionality.

* Fixed validation of secure options to ensure they are either none, ssl or tls.
* Translations : Test email.


Release Date – April 3, 2024

  • New optional settings for all emails sent by WordPress:
    • Addition of “Reply To” option: This feature allows you to specify an email address that recipients will send replies to, instead of the original sender’s email address. This is useful when the sender does not wish to receive replies directly.
    • Addition of “CC” option: “CC” stands for “Carbon Copy”. When you CC an email to someone, you send them a copy of your email. The CC’d person may not be the main recipient of the email, but they are included for their reference. Everyone who receives the email can see who has been CC’d.
    • Addition of “BCC” option: “BCC” stands for “Blind Carbon Copy”. This works like CC, but BCC recipients are hidden from the other recipients. This is useful when you want to inform someone without letting others know that they are also receiving the same email.
  • Incompatible plugin detection: This feature helps identify any plugins that are not compatible and could potentially cause issues (proactive approach to prevent conflicts). It will alert you if an installed plugin is not compatible with the Custom SMTP plugin, allowing you to take necessary action.
  • Comprehensive test email with configuration information


Release Date – March 14, 2024

  • You can test your SMTP settings before saving them.
  • Secure SMTP option accept None as value.
  • Custom CSS for Settings.


Release Date – March 12, 2024

  • Public launch of the plugin!
  • Completely translated into English and French.
  • All SMTP options are editable.