SMTP TLS test with openssl
openssl s_client -starttls smtp -crlf -connect mail.mysite.com:25
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openssl s_client -starttls smtp -crlf -connect mail.mysite.com:25
If it was not available in PEM, then determine which format it is (here: DER), then convert it:
$ openssl x509 -in ca-cerificate-file.crt -inform DER -out ca-cerificate-file.pem -outform PEM
$ openssl x509 -noout -fingerprint -in ca-certificate-file
Then cd there.