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Optin Comment Notifications

Allows users to opt into receiving a notification email whenever a comment is made to the site.

This plugin adds a checkbox to the profile page for users which allows them to opt into receiving a notification email whenever a comment is made to the site.

If a comment goes into moderation, only users who have the ability to manage comments on the site will receive the moderation notification email.

By default, all users of the site have the ability to subscribe to notifications about comments. A filter is provided to facilitate use of code to customize the feature's availability to users.

Note: a "user" is a person with an actual login account for the site. The plugin does not facilitate permitting visitors who do not have an account on the site to be able to subscribe to all comments.

Links: Plugin Homepage | Plugin Directory Page | Author Homepage

Author Scott Reilly
Contributors coffee2code
Tags coffee2code, comment, Commenting, comments, email, notifications
  1. optin-comment-notifications screenshot 1

    A screenshot of the checkbox added to user profiles.

  1. Unzip inside the plugins directory for your site (typically /wp-content/plugins/). Or install via the built-in WordPress plugin installer)
  2. Activate the plugin through the 'Plugins' admin menu in WordPress

1.2 (2017-01-04)

  • New: Permit admins (or more specifically, those who can 'edit_users') to control the setting for other users.
    • Add new capability 'c2c_subscribe_to_all_comments_edit_others'
    • Add 'c2c_optin_comment_notifications_has_cap_edit_others' filter to allow customizing capability for editing setting for other users
    • Show checkbox via 'personal_options' action instead of 'profile_personal_options'
    • Hook 'edit_user_profile_update' to potentially save the setting when another user is being edited
  • Change: Enable more error output for unit tests.
  • Change: Default WP_TESTS_DIR to /tmp/wordpress-tests-lib rather than erroring out if not defined via environment variable.
  • Change: Minor tweaks to code documentation.
  • Change: Note compatibility through WP 4.7+.
  • Change: Remove support for WordPress older than 4.6 (should still work for earlier versions)
  • Change: Update copyright date (2017).

1.1 (2016-03-19)

Highlights: * This release largely consists of minor behind-the-scenes changes.

Details: * Bugfix: Don't use translation functions to output strings not needing translation. * Change: Add support for language packs: * Don't load textdomain from file. * Remove .pot file and /lang subdirectory. * Remove 'Domain Path' plugin header. * New: Add LICENSE file. * New: Add empty index.php to prevent files from being listed if web server has enabled directory listings. * Change: Explicitly declare methods in unit tests as public or protected. * Change: Minor improvements to inline docs and test docs. * Change: Note compatibility through WP 4.4+. * Change: Remove support for WordPress older than 4.1. * Change: Update copyright date (2016).

1.0 (2015-01-12)

  • Initial public release
  • Convert into true plugin
  • Permit any user to subscribe to all comments
  • Add 'c2c_optin_comment_notifications_has_cap' filter to enable customizing capability
  • Change meta key name to 'c2c_comment_notification_optin'
  • Change yes_meta_value from 'Y' to '1'
  • Change from *_usermeta() to *_user_option()
  • Ensure user being notified has the capability to receive notifications
  • For moderated comments, only notify those who have the capability to moderate comments
  • Change class name to c2c_Optin_Comment_Notifications
  • Add unit tests
  • Add icon
  • Add banner
  • Add readme


  • Initial release as theme-packaged plugin on

Who can sign up to receive notifications about comments to the site?

Any user account on the site can sign up for comment notifications. Comments that go into moderation will only trigger notifications to users who can moderate comments. Visitors who do not have an account on the site cannot make use of the plugin to subscribe to comments.

How do I sign up to receive notifications?

On your profile page, there is a checkbox next to "New Comment Emails" that is labeled "Email me whenever a comment is submitted to the site.". Check the checkbox and click the button to update your profile. If you wish to discontinue receiving such notifications, simply uncheck the checkbox and save the change.

Does this plugin include unit tests?


How can I restrict the plugin to only offer the ability to subscribe to all comments to administrators and editors?

Use the 'c2c_optin_comment_notifications_has_cap' filter to customize the capability as needed. The following code can be used or adapted for that purpose. Such code should ideally be put into a mu-plugin or site-specific plugin (which is beyond the scope of this readme to explain).

 * Only permits administrators and editors to subscribe to comment notifications.
 * @param bool  $default The default. Default true.
 * @param array $caps    Array of user capabilities.
 * @return string
function restrict_optin_comment_notifications( $default, $caps ) {
    // Only administrators and editors can subscribe to all comments.
    return !! array_intersect(
        wp_get_current_user()->roles,      // Get current user's roles.
        array( 'administrator', 'editor' ) // Roles to allow to subscribe to all comments.
add_filter( 'c2c_optin_comment_notifications_has_cap', 'restrict_optin_comment_notifications', 10, 2 );

Can an administrator configure the setting for another user?

Yes. Users with the 'edit_users' capability (administrators, basically) and can edit the profile of another user can configure this plugin for that user. The checkbox is labeled "Email this user whenever a comment is submitted to the site.".

Version 1.2

Requires WordPress version: 4.6 or higher

Compatible up to: 4.7.2

Last Updated 23 Jan 2017

Date Added: 12 Jan 2015

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