Can gu3x7o717ca5wg3ili.tk receive emails?
No, gu3x7o717ca5wg3ili.tk cannot receive emails because
it has neither an A record nor MX records.
Should you allow users to sign up to your website using the domain gu3x7o717ca5wg3ili.tk?
No, gu3x7o717ca5wg3ili.tk is a throwaway domain and
should be blocked.
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