example.com is a second level domain, not a top level domain.
The function you quoted deals with TLD, as in not.existing.example

example.com seems to be treated as any other domain, which is by looking it up in DNS - which fails if there's no corresponding record

In reply to Re^3: Email::Valid rejecting emails @example.com today by soonix
in thread Email::Valid rejecting emails @example.com today by grantm

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