SignEmail SMTP & DNS Diagnostic

🚨 Are your WordPress emails going to spam? Without proper email authentication, services like Gmail, Outlook, and Yahoo may block or mark your emails as spam. This results in lost notifications, password resets, and order emails. SignEmail SMTP helps you send reliable WordPress emails using professional SMTP servers, with optional DKIM authentication support. Why email authentication matters Modern email providers require proper authentication (SPF, DKIM, DMARC) to trust your messages. Without it, even valid emails may be filtered as spam. 📬 SMTP Email Delivery Send all WordPress emails through reliable SMTP servers instead of PHP mail(), improving deliverability and consistency. ⚙️ Universal SMTP Compatibility Compatible with Gmail, Outlook, Brevo, cPanel, OVH, Infomaniak, SiteGround, GoDaddy, Bluehost, WP Engine, Kinsta, Namecheap, Gandi, o2switch, LWS, and more. 🔍 Email Testing Tool Send test emails to verify inbox delivery and diagnose spam placement in real conditions. 🔎 DNS Diagnostic Tool Check SPF, DKIM, and DMARC records using Cloudflare DNS-over-HTTPS. 🔒 Secure Storage SMTP credentials are encrypted using AES-256-CBC and stored securely in your WordPress database. 🌐 Multilingual Support Full French and English interface with per-user language selection. SMTP Features

• Full SMTP configuration (SSL / TLS / STARTTLS / None)
• Encrypted password storage (AES-256-CBC)
• Force sender email and name
• Debug logging system
• Built-in email test tool
• DNS verification (SPF / DKIM / DMARC)
• Compatible with WooCommerce, CF7, Elementor, Gravity Forms, BuddyPress, LearnDash, etc.
• Fully intercepts wp_mail()

Optional DKIM Support DKIM email signing is available in the Premium version of this plugin — smtp-dkim.com.

• Works alongside SMTP delivery
• Improves inbox trust and deliverability

Security & Privacy

• SMTP credentials encrypted before storage
• No credentials are sent to external servers
• License verification (if used) only transmits license key + domain name
• No email content is ever transmitted externally

1. Upload plugin folder to /wp-content/plugins/
2. Activate plugin
3. Open SignEmail SMTP menu in WordPress admin
4. Configure SMTP settings
5. Run email test
6. (Optional) Configure DKIM if supported by your mail provider
7. Run DNS diagnostic tool

2.4.37 – April 23, 2026

• Improved compatibility with WordPress.org plugin guidelines
• Configuration summary card now shows DKIM section status consistently
• External test email section: description text simplified and always visible

2.4.36 – April 23, 2026

• SMTP debug log now stored in wp-content/uploads/ with .htaccess and index.php protection
• External Services section expanded with Cloudflare Terms of Service and Privacy Policy links
• Removed deactivation feedback form

2.4.35 – April 21, 2026

• Updated language strings to neutral terminology
• Removed redundant UI notices from settings page
• Fixed SMTP debug log button flickering during live email test polling
• Moved all CSS and JavaScript to properly enqueued external files

2.4.30 – April 19, 2026

• Improved live SMTP debug log writing during email send
• Minor UI improvements to settings page fields

2.4.20 – April 13, 2026

• DNS diagnostic improvements and card layout fixes
• Configuration summary card moved to top of settings page

2.3.9 – April 6, 2026

• Added external email test tool
• UX improvements for DNS setup guidance

2.3.0 – April 2, 2026

• WordPress 6.9 compatibility confirmed
• General stability improvements

2.2.0 – March 28, 2026

• Auto-update support added
• General improvements

2.0.0 – March 3, 2026

• Major refactor of internal architecture
• General stability improvements

1.0.0 – March 1, 2026

• Initial release