Blocking Specific Email Addresses on Registration

Ultimate Member allows you to block specific email addresses from registering or signing in on your site.

Go to wp-admin> Ultimate Member> Settings > Access> Others.
To block multiple email addresses, you must use one blocked email address per line.

If you encounter any issues or a security configuration warning message appears. You can try and use this code:

Change one line from the code above as indicated below to block multiple email addresses by using a comma as a separator.