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block-email
3 プラグイン
Gravity Forms Block Email Domains
Easily set a list of email domains to block on email fields in Gravity Forms.
Block domain email addresses for Contact Form 7
Blocks spammers sending contact forms using an email address from the domain of the WordPress installation in Contact Form 7.
Blacklist Unwanted Email - Formidable Forms
This is a free add-on plugin for Formidable Forms , which validates the email field and restrict unwanted email submission as well as allowed only bus …