FlowSMTP

A modern SMTP plugin for WordPress with email logging, failed-email tracking & resend, and a built-in test email system — wrapped in a sleek, clean admin UI.

✨ Features

• SMTP delivery — routes all wp_mail() traffic through your SMTP server via phpmailer_init (host, port, TLS/SSL/none, authentication).
• Email logs — every outgoing email is recorded in a custom database table with recipient, subject, body, headers, attachments and timestamps.
• Failed emails — a dedicated tab listing failed sends with the exact SMTP error message, plus one-click Resend with retry counting.
• Test email system — send an HTML or plain-text test email from the admin and see the real server response instantly.
• Force From address/name — override the default wordpress@ sender across all plugins.
• Log retention — automatic daily cleanup after a configurable number of days (0 = keep forever).
• Dashboard stats — sent / failed / pending counters in the header.
• Modern UI — gradient header, pill badges, toggle switches, searchable log table, detail modal, pagination.
• Security minded — capability checks, nonces on every AJAX action, sanitized inputs, prepared SQL statements, obfuscated stored password.

📦 Installation

1. Download this repository as a ZIP (or clone it into wp-content/plugins/flow-smtp).
2. Activate FlowSMTP from Plugins in wp-admin.
3. Go to FlowSMTP → Settings, enter your SMTP credentials and save.
4. Open FlowSMTP → Send Test and send yourself a test email.

🗂 Structure

flow-smtp/
├── flow-smtp.php                   # Bootstrap, constants, activation (log table)
├── uninstall.php                   # Removes options + log table on uninstall
├── includes/
│   ├── class-flowsmtp.php          # Core loader / settings accessor
│   ├── class-flowsmtp-mailer.php   # phpmailer_init SMTP config, From filters, test email
│   ├── class-flowsmtp-logger.php   # Log table CRUD, failure capture, resend, retention
│   └── class-flowsmtp-admin.php    # Admin page (Settings / Logs / Failed / Test) + AJAX
└── assets/
    ├── css/admin.css               # Modern admin styling
    └── js/admin.js                 # Test email, resend, view modal, bulk delete

🔒 Security notes

• The SMTP password is stored obfuscated (salt-XOR + base64), not in plain text. For maximum security, define credentials in wp-config.php and filter the option instead.
• All admin actions require manage_options and a valid nonce.
• All queries use $wpdb->prepare().

🧭 Roadmap

• [ ] Provider presets (Gmail, Outlook, SendGrid, Mailgun, Brevo…)
• [ ] Weekly email delivery summary
• [ ] Automatic retry queue for failed emails (cron-based)
• [ ] Export logs as CSV
• [ ] Multisite support

📄 License

GPL-2.0-or-later. Built by Joytirmoy Halder Joyti.