# Copy Admin Notification Emails to Slack

> Posts the subject and the start of every email sent to the site admin address into a Slack channel, so the team sees new users, comments and alerts where they already work.

- Type: PHP
- Runs: Run everywhere
- Category: [Email](https://wpide.com/library/category/email/)
- Tags: email, slack, notifications
- Author: WPIDE Team
- Installs: 0
- Updated: 2026-10-28
- Page: https://wpide.com/library/email-copy-admin-emails-to-slack/

## Code

```php
add_filter( 'wp_mail', function ( $atts ) {
    $url   = defined( 'WPIDE_SLACK_WEBHOOK_URL' ) ? (string) WPIDE_SLACK_WEBHOOK_URL : '';
    $admin = strtolower( (string) get_option( 'admin_email' ) );
    $to    = strtolower( implode( ',', (array) $atts['to'] ) );

    if ( 0 !== strpos( $url, 'https://hooks.slack.com/' ) || false === strpos( $to, $admin ) ) {
        return $atts;
    }

    $escape = function ( $text ) {
        return str_replace( array( '&', '<', '>' ), array( '&amp;', '&lt;', '&gt;' ), (string) $text );
    };

    $text = sprintf( "*%s*\n%s", $escape( wp_strip_all_tags( (string) $atts['subject'] ) ), $escape( wp_html_excerpt( trim( wp_strip_all_tags( (string) $atts['message'] ) ), 500, '…' ) ) );

    wp_safe_remote_post( $url, array(
        'body'     => wp_json_encode( array( 'text' => $text ) ),
        'headers'  => array( 'Content-Type' => 'application/json' ),
        'timeout'  => 5,
        'blocking' => false,
    ) );

    return $atts;
}, 900 );
```

## Notes

Define WPIDE_SLACK_WEBHOOK_URL in wp-config.php; only emails addressed to the admin email are copied, and they are still sent as usual.

## How to use it

Install the free WPIDE plugin (https://wordpress.org/plugins/wpide/), find "Copy Admin Notification Emails to Slack" in its snippet library and add it in one click; or create a new PHP snippet in WPIDE (or any code snippets plugin) and paste the code above. More snippets: https://wpide.com/library/