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Option 'cathcall' will not validate email addresses when they are on a catch-all domain :)
Sometimes this is handy ....
Enter email for validation: email_address@catchall.domain
Validate MX record? [yN] y
Try to contact server for address validation? [yN] y
Accept catch-all? [yN] y
Valid!
Enter email for validation: email_address@catchall.domain
Validate MX record? [yN] y
Try to contact server for address validation? [yN] y
Accept catch-all? [yN] n
Invalid!