=== SwiftTrap for Mailtrap ===
Contributors: simmotorlp
Tags: mailtrap, transactional-email, email-api, wp-mail, email-log
Requires at least: 6.0
Tested up to: 7.0
Stable tag: 2.4.2
Requires PHP: 8.0
License: GPLv2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html

Send WordPress emails through the Mailtrap Email API (not SMTP). Bulk and transactional streams, categories, suppression list, email log.

== Description ==

**SwiftTrap** is a drop-in replacement for `wp_mail()` that routes WordPress email through the **Mailtrap Email Sending API** instead of SMTP. It is purpose-built for Mailtrap — not a generic SMTP plugin with a Mailtrap preset — so it exposes Mailtrap-native features that SMTP cannot: bulk vs transactional stream routing, email categories, custom variables for tracking, suppression lists, and domain verification status.

= Why HTTP API instead of SMTP? =

* **Lower latency** — one HTTPS call per message, no MAIL FROM / RCPT TO / DATA round-trips.
* **Better deliverability** — Mailtrap routes API messages through its dedicated transactional and bulk streams; SMTP doesn't expose stream selection.
* **Native categories** — every email is automatically categorized (welcome, password-reset, notification, marketing, etc.) so you can filter and report on them in Mailtrap.
* **No firewall headaches** — port 587/465 blocked? API works over standard HTTPS 443.

= Why SwiftTrap and not WP Mail SMTP / Post SMTP =

* Generic SMTP plugins use Mailtrap's SMTP credentials and lose every Mailtrap-only feature.
* SwiftTrap calls `send.api.mailtrap.io` for transactional mail and `bulk.api.mailtrap.io` for bulk mail — automatically, based on category or via filter.
* No Mailtrap PHP SDK required. Plugin is **~30 KB total** and uses only the WordPress HTTP API (`wp_remote_post`).
* Stats page shows your sending domain verification status and the live suppression list (bounces, complaints, unsubscribes).

= Features =

* Drop-in replacement for `wp_mail()` — works with WooCommerce, Contact Form 7, Gravity Forms, and any plugin that uses WordPress mail.
* Automatic email categorization and stream routing overrides via settings grid.
* Delivery Tracking & Webhooks — Real-time event tracking via custom REST route `swifttrap/v1/webhook`.
* Suppression Management — CRUD panel for Mailtrap suppression lists with pre-send recipient suppression checks.
* Reliability Fallback — Graceful failover back to WordPress native `wp_mail()` if the Mailtrap API call fails.
* Site Health integration — Verification test checking Mailtrap token status and sending domain verification.
* Advanced Admin Log — Search and filter logs, view rendered HTML/text bodies in modals, and manual email resend capability.
* CSV Export — Download complete email logs directly from the dashboard.
* WP-CLI commands — Command-line management via `wp swifttrap` (test, stats, prune-logs, send-suppression-sync).
* Attachment size guard — Configurable limits to prevent oversized files from rejecting at the API gateway.
* Test email button on the settings page.
* Mailtrap template support via `template_uuid`.
* Falls back to default WordPress mail handler when disabled or token is empty.

= Extensible via filters =

* `swifttrap_mailtrap_email_category` — override the auto-detected email category.
* `swifttrap_mailtrap_use_bulk_stream` — force a message into the bulk or transactional stream.
* `swifttrap_mailtrap_template` — send via a Mailtrap template by `template_uuid`.
* `swifttrap_mailtrap_custom_variables` — attach tracking metadata to outgoing emails.

= Privacy =

This plugin sends email payloads (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 the [Mailtrap Privacy Policy](https://mailtrap.io/privacy-policy). No data is sent anywhere else.

== Installation ==

1. Install from **Plugins → Add New** and search for *SwiftTrap for Mailtrap*, or upload the `swifttrap-for-mailtrap` folder to `/wp-content/plugins/`.
2. Activate the plugin.
3. Go to **Mailtrap → Settings**.
4. Paste your Mailtrap **Send API token** (Mailtrap dashboard → Sending Domains → API Tokens).
5. Set your verified sender email and name.
6. Click **Send test email** to verify delivery.

== Frequently Asked Questions ==

= Why use SwiftTrap instead of WP Mail SMTP or Post SMTP with Mailtrap credentials? =

WP Mail SMTP and Post SMTP route through Mailtrap's SMTP gateway and treat Mailtrap as just another SMTP host. SwiftTrap uses Mailtrap's HTTP Send API, which exposes features SMTP cannot: bulk vs transactional stream routing, categories, custom tracking variables, template UUIDs, and live suppression-list visibility. Use SwiftTrap if you want Mailtrap-native behavior; use a generic SMTP plugin if you want a one-config-fits-all-providers setup.

= Does it support Mailtrap email templates? =

Yes — use the `swifttrap_mailtrap_template` filter to send via a `template_uuid`. The template variables can be passed through Mailtrap's standard template-variables payload.

= How does bulk stream routing work? =

By default, marketing/promotional categories are routed to `bulk.api.mailtrap.io` and everything else to `send.api.mailtrap.io`. Override per-message with the `swifttrap_mailtrap_use_bulk_stream` filter — useful for batch newsletters from a custom plugin.

= Where do I get my API token? =

Log in to [mailtrap.io](https://mailtrap.io), open your sending domain, go to **API Tokens**, and create a token with sending permissions.

= What happens if I disable the plugin or remove the token? =

WordPress falls back to its default `wp_mail()` handler. No emails are silently dropped.

= Does the plugin require the Mailtrap PHP SDK? =

No. SwiftTrap calls the Mailtrap REST API directly via the WordPress HTTP API. Total plugin size is around 30 KB.

= What data is sent externally? =

Email data (recipients, subject, body, attachments) goes to `send.api.mailtrap.io` and `bulk.api.mailtrap.io`. Account stats are fetched from `mailtrap.io/api/accounts`. See the [Mailtrap Privacy Policy](https://mailtrap.io/privacy-policy).

= Is there an attachment size limit? =

Yes — 25 MB per email (matches Mailtrap's API limit).

== Screenshots ==

1. Settings page — API token, verified sender, stream routing.
2. Stats page — sending domain verification status and suppression list (bounces, complaints, unsubscribes).
3. Email log with retention controls.
4. Dashboard widget showing integration status, sender, and quick links to Stats and Settings.
5. Test email confirmation.

== Changelog ==

= 2.4.2 =
* Fixed: The email log dropped most entries during high-volume or concurrent sends. Each write re-read and rewrote the whole log file, so parallel processes overwrote each other's lines. Writes now use an atomic, exclusively-locked append, so the Stats dashboard (sends-per-day, categories, totals) reflects the real number of sent emails.
* Improved: Logging no longer slows down large mailings — appends are O(1) instead of re-reading and rewriting the entire file on every email.

= 2.4.1 =
* Fixed: Suppression list now reads the Mailtrap `type` field, so the dashboard shows real BOUNCE / COMPLAINT / UNSUBSCRIBE / MANUAL counts instead of marking every record as manual.
* New: Suppression rows display the message bounce category (when provided) for hard-bounce detail.
* Fixed: Suppression dates are now formatted server-side using the site's date format instead of the browser locale.
* New: "View all in Mailtrap" link on the Suppressions card.
* New: Per-page selector (10/25/50/100) on the Email Logs screen.
* Improved: Email Logs header actions aligned to the right; date filter input restyled to match other fields.

= 2.4.0 =
* New: REST Webhook Endpoint (`swifttrap/v1/webhook`) for tracking delivered, bounced, opened, and clicked statuses.
* New: Suppression Management CRUD in Admin Stats and pre-send recipient checks to skip suppressed emails.
* New: Fallback mechanism returning `null` in `pre_wp_mail` on API failure so native `wp_mail` sends the email instead.
* New: Site Health connection and verified domain status test.
* New: Upgraded Admin logs UI with search, filtering, CSV export, iframe payload preview modals, and resend actions.
* New: Category settings grid for category stream mapping rules and sender overrides.
* New: WP-CLI namespace `wp swifttrap` (test, stats, prune-logs, send-suppression-sync).
* New: Attachment size guard setting.
* Refactored: Extracted CSV row formatter into a helper function for unit tests. Fully covered and verified by the test suite.

= 2.3.0 =
* PHP 8.0 is now the minimum; tested up to WordPress 7.0.
* Reliability: automatic retry with backoff on transient Mailtrap API errors (429/5xx, honors Retry-After).
* Deterministic log retention via a daily cron event (replaces the previous probabilistic cleanup).
* Account/stats/domain/suppression caches are now keyed per API token, so switching tokens no longer serves stale data.
* Robust JSON handling for all Mailtrap API responses; multisite-safe settings cache.
* New: "Verify token" button on the settings screen.
* Code modernized to PHP 8 idioms; first unit-test suite added.

= 2.2.2 =
* Plugin URI: now points to the dedicated landing page at https://plugins.symonov.com/swifttrap-for-mailtrap/
* No code or behavior changes

= 2.2.1 =
* Readme: USP-first rewrite emphasizing Mailtrap Email API (vs SMTP) and bulk/transactional stream routing
* Tags: replaced `email`/`mail`/`smtp` with targeted `mailtrap`, `transactional-email`, `email-api`, `wp-mail`, `email-log`
* FAQ: added comparison with WP Mail SMTP / Post SMTP, Mailtrap template support, and bulk stream routing
* Tested up to WordPress 7.0

= 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

== Upgrade Notice ==

= 2.4.0 =
Upgrades WordPress plugin to 2.4.0, introducing delivery tracking webhooks, suppression management, graceful native fallback, enhanced logs UI with CSV export, WP-CLI commands, and a WordPress Site Health check.

= 2.3.0 =
Minor reliability release: automatic sending retries on transient API errors, cron-based log cleanup, and modern PHP 8 updates.

= 2.2.2 =
Plugin URI now points to the dedicated landing page on plugins.symonov.com. No code changes.

= 2.2.1 =
Documentation-only release. Refreshed readme and confirmed compatibility with WordPress 7.0.

= 2.2.0 =
WordPress Coding Standards pass — WP_Filesystem API, hardened input sanitization, and improved PHPDoc. No configuration changes required.
