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gwollman/check_smtp_starttls.sh

Last active January 22, 2021 01:37
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Use openssl s_client to check the TLS certificates of an SMTP server using STARTTLS
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check_smtp_starttls.sh
#!/bin/sh
echo QUIT | openssl s_client -connect "$1":25 -starttls smtp -name "$1" -showcerts -verify 1 -verify_return_error
# To send a client certificate, add:
# -cert /path/to/cert -key /path/to/key -cert_chain /path/to/chain
# for example, if you are using acmetool(1),
# acmedir=/var/db/acme/live/$(hostname)
# -cert $acmedir/cert -key $acmedir/privkey -cert_chain $acmedir/full_chain
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