For my WordPress website I use third party SMTP server with a limit on number of recipients. Is there any plugin that I can use to split messages to limit maximum emails in BCC?

For example, server limit is 50, so if I have 60 subscribers to a forum or topic, I want server to send two emails. One with 50 and the other one with 10 emails.

[@casiepa Moderator 7 years, 8 months ago]

Hi @tananaev ,

It took me some time to look around, but maybe https://wordpress.org/plugins/asyncronous-bbpress-subscriptions/ can help you ?

[@tananaev Participant 7 years, 8 months ago]

Thanks for suggestion, but I have actually already implemented it myself. Basically I took original bbpress methods and modified them slightly to split messages by 50 subscribers.

[@casiepa Moderator 7 years, 8 months ago]

@tananaev

You created/used filters ? Or you just rewrote the functions ?
If you want to share your work, please do.

Pascal.

[@tananaev Participant 7 years, 8 months ago]

I added functions to “functions.php” in my theme:

I’m not a PHP developer and I’m not a WordPress expert, so I’m sure it’s far from perfect, but here is my code:

function custom_bbp_notify_topic_subscribers( $reply_id = 0, $topic_id = 0, $forum_id = 0, $anonymous_data = false, $reply_author = 0 ) {

    // Bail if subscriptions are turned off
    if ( !bbp_is_subscriptions_active() ) {
        return false;
    }

    /** Validation ************************************************************/

    $reply_id = bbp_get_reply_id( $reply_id );
    $topic_id = bbp_get_topic_id( $topic_id );
    $forum_id = bbp_get_forum_id( $forum_id );

    /** Topic *****************************************************************/

    // Bail if topic is not published
    if ( !bbp_is_topic_published( $topic_id ) ) {
        return false;
    }

    /** Reply *****************************************************************/

    // Bail if reply is not published
    if ( !bbp_is_reply_published( $reply_id ) ) {
        return false;
    }

    // Poster name
    $reply_author_name = bbp_get_reply_author_display_name( $reply_id );

    /** Mail ******************************************************************/

    // Remove filters from reply content and topic title to prevent content
    // from being encoded with HTML entities, wrapped in paragraph tags, etc...
    remove_all_filters( 'bbp_get_reply_content' );
    remove_all_filters( 'bbp_get_topic_title'   );

    // Strip tags from text and setup mail data
    $topic_title   = strip_tags( bbp_get_topic_title( $topic_id ) );
    $reply_content = strip_tags( bbp_get_reply_content( $reply_id ) );
    $reply_url     = bbp_get_reply_url( $reply_id );
    $blog_name     = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );

    // For plugins to filter messages per reply/topic/user
    $message = sprintf( __( '%1$s wrote:

%2$s

Post Link: %3$s

-----------

You are receiving this email because you subscribed to a forum topic.

Login and visit the topic to unsubscribe from these emails.', 'bbpress' ),

        $reply_author_name,
        $reply_content,
        $reply_url
    );

    $message = apply_filters( 'bbp_subscription_mail_message', $message, $reply_id, $topic_id );
    if ( empty( $message ) ) {
        return;
    }

    // For plugins to filter titles per reply/topic/user
    $subject = apply_filters( 'bbp_subscription_mail_title', '[' . $blog_name . '] ' . $topic_title, $reply_id, $topic_id );
    if ( empty( $subject ) ) {
        return;
    }

    /** Users *****************************************************************/

    // Get the noreply@ address
    $no_reply   = bbp_get_do_not_reply_address();

    // Setup "From" email address
    $from_email = apply_filters( 'bbp_subscription_from_email', $no_reply );

    // Get topic subscribers and bail if empty
    $user_ids = bbp_get_topic_subscribers( $topic_id, true );

    // Dedicated filter to manipulate user ID's to send emails to
    $user_ids = apply_filters( 'bbp_topic_subscription_user_ids', $user_ids );
    if ( empty( $user_ids ) ) {
        return false;
    }

    $to_email = apply_filters( 'bbp_subscription_to_email', $no_reply );

    do_action( 'bbp_pre_notify_subscribers', $reply_id, $topic_id, $user_ids );

    for ( $i = 0; $i <= count($user_ids); $i++ ) {
        if ( $i % (50 - 1) === 0 || $i === count($user_ids) ) {
            if ( $i !== 0 ) {
                $headers  = apply_filters( 'bbp_subscription_mail_headers', $headers );
                wp_mail( $to_email, $subject, $message, $headers );
            }

            $headers = array( 'From: ' . get_bloginfo( 'name' ) . ' <' . $from_email . '>' );
        }

        if ( $i < count($user_ids) ) {
            // Don't send notifications to the person who made the post
            if ( !empty( $reply_author ) && (int) $user_ids[$i] === (int) $reply_author ) {
                continue;
            }

            // Get email address of subscribed user
            $headers[] = 'Bcc: ' . get_userdata( $user_ids[$i] )->user_email;
        }
    }

    do_action( 'bbp_post_notify_subscribers', $reply_id, $topic_id, $user_ids );

    return true;
}

function custom_bbp_notify_forum_subscribers( $topic_id = 0, $forum_id = 0, $anonymous_data = false, $topic_author = 0 ) {

    // Bail if subscriptions are turned off
    if ( !bbp_is_subscriptions_active() ) {
        return false;
    }

    /** Validation ************************************************************/

    $topic_id = bbp_get_topic_id( $topic_id );
    $forum_id = bbp_get_forum_id( $forum_id );

    /**
     * Necessary for backwards compatibility
     *
     * @see https://bbpress.trac.wordpress.org/ticket/2620
     */
    $user_id  = 0;

    /** Topic *****************************************************************/

    // Bail if topic is not published
    if ( ! bbp_is_topic_published( $topic_id ) ) {
        return false;
    }

    // Poster name
    $topic_author_name = bbp_get_topic_author_display_name( $topic_id );

    /** Mail ******************************************************************/

    // Remove filters from reply content and topic title to prevent content
    // from being encoded with HTML entities, wrapped in paragraph tags, etc...
    remove_all_filters( 'bbp_get_topic_content' );
    remove_all_filters( 'bbp_get_topic_title'   );

    // Strip tags from text and setup mail data
    $topic_title   = strip_tags( bbp_get_topic_title( $topic_id ) );
    $topic_content = strip_tags( bbp_get_topic_content( $topic_id ) );
    $topic_url     = get_permalink( $topic_id );
    $blog_name     = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );

    // For plugins to filter messages per reply/topic/user
    $message = sprintf( __( '%1$s wrote:

%2$s

Topic Link: %3$s

-----------

You are receiving this email because you subscribed to a forum.

Login and visit the topic to unsubscribe from these emails.', 'bbpress' ),

        $topic_author_name,
        $topic_content,
        $topic_url
    );

    $message = apply_filters( 'bbp_forum_subscription_mail_message', $message, $topic_id, $forum_id, $user_id );
    if ( empty( $message ) ) {
        return;
    }

    // For plugins to filter titles per reply/topic/user
    $subject = apply_filters( 'bbp_forum_subscription_mail_title', '[' . $blog_name . '] ' . $topic_title, $topic_id, $forum_id, $user_id );
    if ( empty( $subject ) ) {
        return;
    }

    /** User ******************************************************************/

    // Get the noreply@ address
    $no_reply   = bbp_get_do_not_reply_address();

    // Setup "From" email address
    $from_email = apply_filters( 'bbp_subscription_from_email', $no_reply );

    // Get topic subscribers and bail if empty
    $user_ids = bbp_get_forum_subscribers( $forum_id, true );

    // Dedicated filter to manipulate user ID's to send emails to
    $user_ids = apply_filters( 'bbp_forum_subscription_user_ids', $user_ids );
    if ( empty( $user_ids ) ) {
        return false;
    }

    $to_email = apply_filters( 'bbp_subscription_to_email', $no_reply );

    do_action( 'bbp_pre_notify_forum_subscribers', $topic_id, $forum_id, $user_ids );

    for ( $i = 0; $i <= count($user_ids); $i++ ) {
        if ( $i % (50 - 1) === 0 || $i === count($user_ids) ) {
            if ( $i !== 0 ) {
                $headers  = apply_filters( 'bbp_subscription_mail_headers', $headers );
                wp_mail( $to_email, $subject, $message, $headers );
            }

            $headers = array( 'From: ' . get_bloginfo( 'name' ) . ' <' . $from_email . '>' );
        }

        if ( $i < count($user_ids) ) {
            // Don't send notifications to the person who made the post
            if ( !empty( $topic_author ) && (int) $user_ids[$i] === (int) $topic_author ) {
                continue;
            }

            // Get email address of subscribed user
            $headers[] = 'Bcc: ' . get_userdata( $user_ids[$i] )->user_email;
        }
    }

    do_action( 'bbp_post_notify_forum_subscribers', $topic_id, $forum_id, $user_ids );

    return true;
}

function custom_bbp_init () {

    remove_action ('bbp_new_reply', 'bbp_notify_topic_subscribers', 11);
    add_action ('bbp_new_reply', 'custom_bbp_notify_topic_subscribers', 11, 5);

    remove_action ('bbp_new_topic', 'bbp_notify_forum_subscribers', 11);
    add_action ('bbp_new_topic', 'custom_bbp_notify_forum_subscribers', 11, 4);

}

add_action ('bbp_init', 'custom_bbp_init', 99);