Comment to allow only gmail accounts to sign up
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Baloo there is already big list of disposable emails are blocked:
You can add more by executing the following query:
INSERT IGNORE INTO `bx_antispam_disposable_email_domains` (`id`, `domain`, `list`) VALUES (NULL, 'badmail.com', 'custom_blacklist'), (NULL, 'dirtymail.com', 'custom_blacklist');