I found your problem: the example.com domain is not really even supposed to resolve, much less have ever had valid MX records. The validation is working correctly: email addresses on example.com are not valid and you should not be using those in test data that is supposed to pass validation.

Prove it :)

In reply to Re^2: Email::Valid rejecting emails @example.com today by Anonymous Monk
in thread Email::Valid rejecting emails @example.com today by grantm

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