SwiftTrap for Mailtrap

By Serhii Symonov

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Description

SwiftTrap for Mailtrap replaces the default WordPress wp_mail() with the Mailtrap Send API.

Features:

Send transactional and bulk emails via Mailtrap
Automatic email categorization (welcome, password-reset, notification, etc.)
Bulk stream routing for promotional emails
Email logging with retention management
Dashboard widget with account stats
Test email from settings page

No SDK required — uses the WordPress HTTP API (wp_remote_post) for zero external dependencies.

Extensible via filters:

swifttrap_mailtrap_email_category — override email category
swifttrap_mailtrap_use_bulk_stream — control bulk stream routing
swifttrap_mailtrap_template — send via Mailtrap template (template_uuid)
swifttrap_mailtrap_custom_variables — attach tracking metadata to emails

Installation

Upload the swifttrap-for-mailtrap folder to /wp-content/plugins/
Activate the plugin
Go to Mailtrap Settings
Enter your Mailtrap Send API token
Configure sender email and name

FAQ

Where do I get my API token?: Log in to mailtrap.io, go to your sending domain, and copy the API token.
What data is sent externally?: This plugin sends email data (recipients, subject, body, attachments) to the Mailtrap API at send.api.mailtrap.io and bulk.api.mailtrap.io. Account stats are fetched from mailtrap.io/api/accounts. See Mailtrap Privacy Policy.
Does the plugin work without Mailtrap?: When disabled or if the API token is empty, WordPress falls back to its default mail handler.

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Contributors & Developers

“SwiftTrap for Mailtrap” is open source software. The following people have contributed to this plugin.

Serhii Symonov

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Interested in development?

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

Changelog

2.2.0

Replaced all file_get_contents/file_put_contents with WP_Filesystem API
Fixed $_GET sanitization with proper wp_unslash() and phpcs annotations
Improved PHPDoc headers across all files
Better WordPress Coding Standards compliance

2.1.0

Added sending domain verification status on Stats page
Added suppression list (bounces, complaints, unsubscribes) on Stats page
Added swifttrap_mailtrap_template filter for Mailtrap template support
Added swifttrap_mailtrap_custom_variables filter for email tracking metadata
Extracted reusable swifttrap_mailtrap_get_account_id() with transient caching

2.0.0

Removed Mailtrap SDK dependency — uses WordPress HTTP API directly
Zero external dependencies, ~30 KB total plugin size
Improved WP.org compliance

1.3.0

Security: protected log directory from direct web access
Added attachment size validation (25 MB limit)
Added empty recipient validation
Fixed timezone handling in log display
Optimized email category computation
Improved log file locking

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