echo | openssl s_client -connect smtp.office365.com:587 -starttls smtp 2>/dev/null | openssl x509 -noout -dates
notBefore=May 22 07:01:10 2020 GMT
notAfter=Aug 20 07:01:10 2020 GMT
openssl s_client check date
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echo | openssl s_client -connect smtp.office365.com:587 -starttls smtp 2>/dev/null | openssl x509 -noout -dates
notBefore=May 22 07:01:10 2020 GMT
notAfter=Aug 20 07:01:10 2020 GMT