Obtaining certificate chain for mta-sts.seanstaffiery.net, one moment while we download the mta-sts.seanstaffiery.net certificate and related intermediate certificates...
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Revocation check via OCSP and CRL for mta-sts.seanstaffiery.net failed
Sorry, the request for mta-sts.seanstaffiery.net could not be completed...
We could not load the certificate for mta-sts.seanstaffiery.net, it might not exist or we could not reach the server, complete the TLS handshake, etc.
Revoked certificates can't and should not be trusted, these certificate will cause errors like "NET::ERR_CERT_REVOKED" in browsers and expose a security risk.