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② 後台搜尋「SignEmail SMTP & DNS Diagnostic」→ 直接安裝（推薦）
原文外掛簡介
🚨 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
External Services
This plugin connects to the following external services:
1. Cloudflare DNS-over-HTTPS
Used by the DNS Diagnostic tool to check SPF, DKIM, and DMARC records.
Service: Cloudflare DNS-over-HTTPS API
Endpoint: https://cloudflare-dns.com/dns-query
Data sent: Domain name and DKIM selector (no personal data)
When: Only when the admin manually runs the DNS diagnostic tool
Terms of Service: https://www.cloudflare.com/terms/
Privacy Policy: https://www.cloudflare.com/privacypolicy/
2. User-configured SMTP server
Used to deliver WordPress emails via the SMTP protocol.
Service: Any SMTP server configured by the site administrator (e.g. Gmail, Outlook, Brevo, cPanel)
Data sent: Email content as configured by WordPress (wp_mail)
When: Every time WordPress sends an email
Terms of Service and Privacy Policy: Refer to your SMTP provider
3. smtp-dkim.com — License validation (Premium version only)
The Premium version validates the license key to enable DKIM signing.
Endpoint: https://smtp-dkim.com/wp-json/sdlm/v1/validate
Data sent: License key + domain name only — no email content, no SMTP credentials
When: On plugin activation and periodically in the background
Terms of Service: https://smtp-dkim.com/politique-de-confidentialite/
Privacy Policy: https://smtp-dkim.com/politique-de-confidentialite/
Note: The free version available on WordPress.org does not include license validation or DKIM signing.
