How to use same email for multiple users

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I have a very big multisite. And I got a request to enable option that multiple users can use the same email. I found a plugin “Allow Multiple Accounts” which doesn’t work properly. I should figure out some other solution for that. I know that I could use something like adding +sometext to every email, so it will show different to WordPress. Do you have some other solution, that can be done here?

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2 comments

  1. You can use wpmu_validate_user_signup filter to remove the error and then define WP_IMPORTING just to skip the email_exist() check in wp_insert_user() function:

    add_filter('wpmu_validate_user_signup', 'skip_email_exist');
function skip_email_exist($result){
    if(isset($result['errors']->errors['user_email']) && ($key = array_search(__('Sorry, that email address is already used!'), $result['errors']->errors['user_email'])) !== false) {
        unset($result['errors']->errors['user_email'][$key]);
        if (empty($result['errors']->errors['user_email'])) unset($result['errors']->errors['user_email']);
    }
    define( 'WP_IMPORTING', 'SKIP_EMAIL_EXIST' );
    return $result;
}

    UPDATE: for a non Multi-site setup try this code:

    add_filter('pre_user_email', 'skip_email_exist');
function skip_email_exist($user_email){
    define( 'WP_IMPORTING', 'SKIP_EMAIL_EXIST' );
    return $user_email;
}

  2. You can you use the Gmail alias feature:

    and so on.

    All emails will be delivered to the same address (email@gmail.com).

    Inside Gmail, you can distinguish the emails using a filter or a search.
    For example, searching for to:email+1@gmail.com will show only the emails related to the first WordPress account.

    This solution should not break the “Reset password” workflow in WordPress.