BuddyPress.org

@alwaysalready – thanks for posting your solution.
Perhaps you could convert your blog article into a page in the codex.

I found a way to resolve this problem using a mixture of ideas others have shared (including @6logics and @loveplove). I’ve put the details in a blog post here. In summary, what worked for me was the following in the bp-custom.php file:

// Set BP to use wp_mail
add_filter( 'bp_email_use_wp_mail', '__return_true' );
 
// Set messages to HTML
remove_filter( 'wp_mail_content_type', 'set_html_content_type' );
add_filter( 'wp_mail_content_type', 'set_html_content_type' );
function set_html_content_type() {
    return 'text/html';
}
 
// Use HTML template
add_filter( 'bp_email_get_content_plaintext', 'get_bp_email_content_plaintext', 10, 4 );
function get_bp_email_content_plaintext( $content = '', $property = 'content_plaintext', $transform = 'replace-tokens', $bp_email ) {
    if ( ! did_action( 'bp_send_email' ) ) {
        return $content;
    }
    return $bp_email->get_template( 'add-content' );
}
//Optionally remove the filter above after it's run
remove_filter('wp_mail','redirect_mails',20);
 
// Optionally change your email address
add_filter('wp_mail_from','noreply_from');
function noreply_from($from) {
  return 'noreply@YOUR_DOMAIN.org'; //Replace 'YOUR_DOMAIN.org' with email address
}

// Optionally change your from name
add_filter('wp_mail_from_name','noreply_from_name');
function noreply_from_name($name) {
    return 'YOUR_DOMAIN No-Reply'; //Replace 'YOUR_DOMAIN No-Reply' with the from name
}

I found a way to resolve this problem using a mixture of ideas others have shared elsewhere. I’ve put the details in a blog post here. In summary, what worked for me was the following in the bp-custom.php file:

// Set BP to use wp_mail
add_filter( 'bp_email_use_wp_mail', '__return_true' );
 
// Set messages to HTML
remove_filter( 'wp_mail_content_type', 'set_html_content_type' );
add_filter( 'wp_mail_content_type', 'set_html_content_type' );
function set_html_content_type() {
    return 'text/html';
}
 
// Use HTML template
add_filter( 'bp_email_get_content_plaintext', 'get_bp_email_content_plaintext', 10, 4 );
function get_bp_email_content_plaintext( $content = '', $property = 'content_plaintext', $transform = 'replace-tokens', $bp_email ) {
    if ( ! did_action( 'bp_send_email' ) ) {
        return $content;
    }
    return $bp_email->get_template( 'add-content' );
}
//Optionally remove the filter above after it's run
remove_filter('wp_mail','redirect_mails',20);
 
// Optionally change your email address
add_filter('wp_mail_from','noreply_from');
function noreply_from($from) {
  return 'noreply@YOUR_DOMAIN.org'; //Replace 'YOUR_DOMAIN.org' with email address
}

// Optionally change your from name
add_filter('wp_mail_from_name','noreply_from_name');
function noreply_from_name($name) {
    return 'YOUR_DOMAIN No-Reply'; //Replace 'YOUR_DOMAIN No-Reply' with the from name
}

I found a way to resolve this problem using a mixture of ideas, including the suggestions from @bharat and @vbnr. I’ve put the details in a blog post here. In summary, what worked for me was the following in the bp-custom.php file:

// Set BP to use wp_mail
add_filter( 'bp_email_use_wp_mail', '__return_true' );
 
// Set messages to HTML
remove_filter( 'wp_mail_content_type', 'set_html_content_type' );
add_filter( 'wp_mail_content_type', 'set_html_content_type' );
function set_html_content_type() {
    return 'text/html';
}
 
// Use HTML template
add_filter( 'bp_email_get_content_plaintext', 'get_bp_email_content_plaintext', 10, 4 );
function get_bp_email_content_plaintext( $content = '', $property = 'content_plaintext', $transform = 'replace-tokens', $bp_email ) {
    if ( ! did_action( 'bp_send_email' ) ) {
        return $content;
    }
    return $bp_email->get_template( 'add-content' );
}
 
// Optionally change your email address and from name.
add_filter('wp_mail_from','noreply_from');
function noreply_from($from) {
  return 'noreply@YOUR_DOMAIN.org'; //Replace 'YOUR_DOMAIN.org' with email address
}
 
add_filter('wp_mail_from_name','noreply_from_name');
function noreply_from_name($name) {
    return 'YOUR_DOMAIN No-Reply'; //Replace 'YOUR_DOMAIN No-Reply' with the from name
}

You could override the template to showcase your own unique one. Here’s some more info on it.

Theme Compatibility & Template Files

BuddyPress uses its own email api.
This codex page has info re customization.

Emails

@xpc33 Try https://wbcomdesigns.com/downloads/buddypress-redirect/

Just create WP pages and leave them blank.
Then assign them on the screen shown in your shared img.

Register and Activation Pages

Exposing every aspect as an option is untenable.
You need to adjust a template file.
The file in question depends on which BP template pack you are using.
Go to wp-admin > Settings > BuddyPress > Options and note the setting for the Template Pack option.
If you are using Nouveau, then this is the file:
wp-content\plugins\buddypress\bp-templates\bp-nouveau\buddypress\activity\index.php

In that file, find this: <?php bp_get_template_part( 'activity/post-form' ); ?>
And change it to this:

<?php 
     if ( ! bp_is_user() ) {
         bp_get_template_part( 'activity/post-form' ); 
     }
?>

Note: it is recommended that you do not edit the template files in the BuddyPress plugin.
Your changes will be wiped out when you update the plugin on a new release.
Instead, create a template overload and then edit that file.
More info re template overloads:.

adding menu link is not enough, displaying notification will need modification inside header file you can checkout following thread

Creating links to BP specific pages via functions.php

@cmsplay password is not part of the extended profile, it’s core wp
You can also change your password from profile from your BuddyPress profile tabs Setting >> General