Help screen column header Banned E-mail
From Joomla! Documentation
- Banned E-mail. Enter any e-mails to be banned from the site. E-mail addresses containing any of the listed text will be banned. Separate different words with semi-colons ';'. For example, the entry "spam;junk" would ban e-mail addresses such as "myspam@.com" or "firstname.lastname@example.org".