smtpdkim

<p>🚨 Are your WordPress emails going to spam?</p>
<p>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.</p>
<p>SignEmail SMTP helps you send reliable WordPress emails using professional SMTP servers, with optional DKIM authentication support.</p>
<h4>Why email authentication matters</h4>
<p>Modern email providers require proper authentication (SPF, DKIM, DMARC) to trust your messages. Without it, even valid emails may be filtered as spam.</p>
<h4>📬 SMTP Email Delivery</h4>
<p>Send all WordPress emails through reliable SMTP servers instead of PHP mail(), improving deliverability and consistency.</p>
<h4>⚙️ Universal SMTP Compatibility</h4>
<p>Compatible with Gmail, Outlook, Brevo, cPanel, OVH, Infomaniak, SiteGround, GoDaddy, Bluehost, WP Engine, Kinsta, Namecheap, Gandi, o2switch, LWS, and more.</p>
<h4>🔍 Email Testing Tool</h4>
<p>Send test emails to verify inbox delivery and diagnose spam placement in real conditions.</p>
<h4>🔎 DNS Diagnostic Tool</h4>
<p>Check SPF, DKIM, and DMARC records using Cloudflare DNS-over-HTTPS.</p>
<h4>🔒 Secure Storage</h4>
<p>SMTP credentials are encrypted using AES-256-CBC and stored securely in your WordPress database.</p>
<h4>🌐 Multilingual Support</h4>
<p>Full French and English interface with per-user language selection.</p>
<h4>SMTP Features</h4>
<ul>
<li>Full SMTP configuration (SSL / TLS / STARTTLS / None)</li>
<li>Encrypted password storage (AES-256-CBC)</li>
<li>Force sender email and name</li>
<li>Debug logging system</li>
<li>Built-in email test tool</li>
<li>DNS verification (SPF / DKIM / DMARC)</li>
<li>Compatible with WooCommerce, CF7, Elementor, Gravity Forms, BuddyPress, LearnDash, etc.</li>
<li>Fully intercepts wp_mail()</li>
</ul>
<h4>Optional DKIM Support</h4>
<p>DKIM email signing is available in the <strong>Premium version</strong> of this plugin — smtp-dkim.com.</p>
<ul>
<li>Works alongside SMTP delivery</li>
<li>Improves inbox trust and deliverability</li>
</ul>
<h4>Security & Privacy</h4>
<ul>
<li>SMTP credentials encrypted before storage</li>
<li>No credentials are sent to external servers</li>
<li>License verification (if used) only transmits license key + domain name</li>
<li>No email content is ever transmitted externally</li>
</ul>
<h3>External Services</h3>
<p>This plugin connects to the following external services:</p>
<h4>1. Cloudflare DNS-over-HTTPS</h4>
<p>Used by the DNS Diagnostic tool to check SPF, DKIM, and DMARC records.</p>
<ul>
<li>Service: Cloudflare DNS-over-HTTPS API</li>
<li>Endpoint: https://cloudflare-dns.com/dns-query</li>
<li>Data sent: Domain name and DKIM selector (no personal data)</li>
<li>When: Only when the admin manually runs the DNS diagnostic tool</li>
<li>Terms of Service: https://www.cloudflare.com/terms/</li>
<li>Privacy Policy: https://www.cloudflare.com/privacypolicy/</li>
</ul>
<h4>2. User-configured SMTP server</h4>
<p>Used to deliver WordPress emails via the SMTP protocol.</p>
<ul>
<li>Service: Any SMTP server configured by the site administrator (e.g. Gmail, Outlook, Brevo, cPanel)</li>
<li>Data sent: Email content as configured by WordPress (wp_mail)</li>
<li>When: Every time WordPress sends an email</li>
<li>Terms of Service and Privacy Policy: Refer to your SMTP provider</li>
</ul>
<h4>3. smtp-dkim.com — License validation (Premium version only)</h4>
<p>The Premium version validates the license key to enable DKIM signing.</p>
<ul>
<li>Endpoint: https://smtp-dkim.com/wp-json/sdlm/v1/validate</li>
<li>Data sent: License key + domain name only — no email content, no SMTP credentials</li>
<li>When: On plugin activation and periodically in the background</li>
<li>Terms of Service: https://smtp-dkim.com/politique-de-confidentialite/</li>
<li>Privacy Policy: https://smtp-dkim.com/politique-de-confidentialite/</li>
</ul>
<p>Note: The free version available on WordPress.org does not include license validation or DKIM signing.</p>


SignEmail SMTP & DNS Diagnostic

Stop WordPress emails from going to spam. Send emails via SMTP and check SPF, DKIM, DMARC records to improve email deliverability.

corytrevor

<h3>Test email sending, SPF, DKIM & DMARC</h3>
<p>Mailsure provides a simple one-click email authentication test to check if WordPress is able to send properly authenticated emails.</p>
<p>Also included:</p>
<ul>
<li>Send a test email to any address</li>
<li>Mail server IP blacklist check via <a href="https://mxtoolbox.com/" rel="nofollow ugc">MXToolbox</a>. View their privacy policy <a href="https://mxtoolbox.com/privacypolicy.aspx" rel="nofollow ugc">here</a>.</li>
</ul>
<p>Plugin settings are in Tools -> Mailsure</p>


SignEmail SMTP & DNS Diagnostic vs Mailsure