nonletter

<p>This plugin enables you to create simple forms for subscription to your newsletter. It includes a sidebar widget with customizable fields (up to 16) to gather from your users all the information you need for your email marketing campaigns. Users can also use the form to unsubscribe.</p>
<p>From the options pages you can:</p>
<ul>
<li>choose whether you require a double opt-in (users must follow a link in an email message, in order to complete subscription)</li>
<li>specify name and number of text fields in the form</li>
<li>customize text messages and labels</li>
<li>manage subscribed email addresses</li>
<li>donwload PDF file with list of subscribers</li>
<li>download CSV file with list of subscribers</li>
<li>choose whether you want to download all subscribers or only new subscribers</li>
</ul>
<h4>Related features</h4>
<p>(Un)subscription requests can be directly processed by <a href="https://www.sendblaster.com" title="bulk email software" rel="nofollow ugc">SendBlaster bulk email software</a> :</p>
<ul>
<li><a href="https://www.sendblaster.com/free-bulk-emailer-download/" title="bulk email software download" rel="nofollow ugc">download SendBlaster here</a></li>
</ul>
<h4>Plugin Features</h4>
<ul>
<li>Subscribe new members</li>
<li>Unsubscribe existing members</li>
<li>Stores subscribed email addresses (as a useful backup against mail delivery failures)</li>
<li>Purges old email addresses</li>
<li>Customizable sidebar appearance</li>
<li>Customizable texts and labels</li>
<li>Adds to your form up to 5 custom fields</li>
</ul>
<h4>Plugin Options</h4>
<ul>
<li>E-mail address for managing subscriptions</li>
<li>Message to subscriber – subject</li>
<li>Message to subscriber – content</li>
<li>Double Opt-in</li>
<li>Link Love (enable and disable)</li>
<li>Front side messages</li>
<li>Front side appearance and custom fields</li>
<li>Temporary db of newly subscribed members</li>
<li>Automatic temporary db cleanup</li>
</ul>


Newsletter subscription optin module

Plugin for managing subscriptions to a mailing list. It provides a simple form for subscription to your mailing list through single or double opt-in.

croms

<p><strong>Croms MailPress</strong> is a comprehensive email delivery solution designed to provide flexible, reliable, and high-performance mailing capabilities directly from your WordPress dashboard. Whether you need to send personalized newsletters, transactional emails, or bulk announcements, this plugin ensures your emails reach their destination securely and efficiently.</p>
<h3>Key Features</h3>
<ul>
<li><strong>Scheduled Sending:</strong> Easily schedule your emails to be sent at a specific date and time, perfect for newsletters and timed announcements.</li>
<li><strong>Recipient Management & CSV Import:</strong> Send emails to manually entered addresses or upload a CSV file with up to 100,000 recipients.</li>
<li><strong>Detailed History & Resending:</strong> Track the status of every email sent. View success/error logs and easily retry failed deliveries with a single click.</li>
<li><strong>Flexible “FROM” Profiles:</strong> Register and manage multiple sender addresses and their corresponding SMTP server settings. Switch between them seamlessly when composing emails.</li>
<li><strong>Opt-out & Bounce Handling:</strong> Manage user subscriptions with a dedicated opt-out list. Manually or automatically classify emails as allowed, paused, hard bounce, soft bounce, or blacklisted.</li>
<li><strong>Safe Opt-out Page Customization:</strong> The <code>[croms_mailpress_optout]</code> shortcode uses a fixed plugin-controlled template. Administrators can change labels, messages, layout preset, color preset, width, and email visibility without saving arbitrary HTML, CSS, JavaScript, or PHP.</li>
<li><strong>Multiple Sending Methods:</strong> Choose between individual SMTP profiles (Account-based), external SMTP Relays, or high-speed API Integrations for massive scale delivery.</li>
<li><strong>Bulk Delivery via Cron:</strong> Easily schedule and dispatch large volumes of emails using external Cron jobs. The built-in setup guide helps you configure Cron for both rental servers (e.g., cPanel, XServer) and VPS/Cloud environments.</li>
</ul>
<h3>Opt-out Page Design Customization</h3>
<p>The public opt-out form generated by <code>[croms_mailpress_optout]</code> does not provide custom code textareas. This is intentional for WordPress.org review compatibility and user safety. Use the structured settings in <strong>Mail Manager > General Settings</strong> to adjust the heading, explanatory text, button labels, success messages, design preset, color preset, width, and whether the recipient email address is displayed.</p>
<p>For advanced visual customization, add CSS through WordPress core features such as <strong>Appearance > Customize > Additional CSS</strong> or the Site Editor’s CSS tools. The fixed template exposes stable classes such as <code>.croms-mailpress-optout</code>, <code>.croms-mailpress-optout__card</code>, <code>.croms-mailpress-optout__title</code>, <code>.croms-mailpress-optout__notice</code>, and <code>.croms-mailpress-optout__button</code>.</p>
<h3>External Services / Third-Party APIs</h3>
<p>This plugin supports optional delivery through the third-party service <code>smtp-relay.jp</code> (Croms SMTP Relay Service).</p>
<ul>
<li><strong>What the service is used for:</strong> The service is used only when the site administrator selects either the <strong>SMTP Relay</strong> delivery method or the <strong>API Integration</strong> delivery method in this plugin. It is also used when the administrator runs the relay/API connection test from the plugin settings screen.</li>
<li><strong>What data is sent and when:</strong>
<ul>
<li><strong>SMTP Relay:</strong> When the SMTP Relay delivery method is selected and an email is sent, the plugin connects to the configured <code>*.smtp-relay.jp</code> SMTP server and sends the email for relay delivery. This includes the sender address, recipient address, subject, message body, and any attachments included in the email. When the administrator runs the SMTP relay connection test, the plugin connects to the configured <code>*.smtp-relay.jp</code> server to verify connectivity.</li>
<li><strong>API Integration:</strong> When the API delivery method is selected and an email is sent, the plugin sends a JSON request to the configured <code>https://*.smtp-relay.jp/receive.php</code> endpoint. This request includes the API key in the request header, the sender name and address, recipient address, subject, HTML message body, and any attachments included in the email. When the administrator runs the API connection test, the plugin sends a test request to the configured API endpoint that includes the API key and uses the site’s administrator email address as the sender and recipient for the test payload.</li>
</ul>
</li>
<li><strong>Service provider links:</strong> Please review the service terms and privacy policy before using the external delivery methods:
<ul>
<li>Terms of Service: https://wp.croms.jp/smtp-relay-terms/</li>
<li>Privacy Policy: https://wp.croms.jp/smtp-relay-privacypolicy/</li>
</ul>
</li>
</ul>


Croms MailPress

A powerful and flexible email delivery manager for WordPress. Supports multiple SMTP profiles, external SMTP relays, and high-speed API integrations.

Newsletter subscription optin module vs Croms MailPress