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Filter Emails
You can filter the email fields by using the bp_email_set_tokens filter hook found in /bp-core/classes/class-bp-email.php.
For example, this will limit the BuddyPress message content to 50 words.Change 50 to whatever integer you want.
function bp_email_content_length( $formatted_tokens, $tokens, $obj ) {
$formatted_tokens['usermessage'] = wp_trim_words( $formatted_tokens['usermessage'], 50, '...' );
return $formatted_tokens;
}
add_filter( 'bp_email_set_tokens', 'bp_email_content_length', 10, 3 );