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ffittschen/mail-server-cert-expiry-check.md

Last active September 9, 2016 10:37
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Check mail server certificate expiry
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mail-server-cert-expiry-check.md

How to show the expiration date of certificates of a mail server

openssl s_client -connect host:port | openssl x509 -enddate -noout

e.g. the command

openssl s_client -connect imap.gmail.com:993 | openssl x509 -enddate -noout

returns:

depth=2 /C=US/O=GeoTrust Inc./CN=GeoTrust Global CA
verify error:num=20:unable to get local issuer certificate
verify return:0
notAfter=Nov 24 13:45:00 2016 GMT
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