Multisite User get "Sorry, that email address is not allowed!" although there Mail adresses are valid

[webdevplan]

The cause is in wp-includes/ms-functions.php, line 464:

if ( ! in_array( $emaildomain, $limited_email_domains ) ) {
	$errors->add('user_email', __('Sorry, that email address is not allowed!'));
}

it has to be:

if (in_array( $emaildomain, $limited_email_domains ) ) {
	$errors->add('user_email', __('Sorry, that email address is not allowed!'));
}

without ! before "in_array"!

[ocean90]

Hello @webdevplan, welcome to WordPress Trac!

Thanks for your report. What's the value of your limited_email_domains option? The condition looks right to me. This option is used to limit site registrations to certain domains (whitelist). If your users are using another domain they would get the message.
If you want to block certain domains you'd have to use the "Banned Email Domains" option (banned_email_domains) which is a blacklist.

[MaximeCulea]

Hello @webdevplan,

As I played recently (last week) with limited_email_domains and banned_email_domains, I agree with @ocean90 with the current behaviour for user register :
limited_email_domains => only use theses emails domains
banned_email_domains => expect all but not theses emails domains

I just checked in multisite context, it seems all good for now in 4.7.2 version ! :)

[webdevplan]

Oh, the reason for the error was on our side.

Thank you to both.