www.br0tkasten.de/content/nerdstuff/certificates.md

title	menu
Certificates	main parent Nerdstuff

Retrieve certificate information from server

HTTPS

openssl s_client -connect mail.br0tkasten.de:443 -servername mail.br0tkasten.de </dev/null 2>/dev/null | openssl x509 -noout -text

IMAP with STARTTLS

openssl s_client -starttls imap -connect mail.br0tkasten.de:143 </dev/null 2>/dev/null | openssl x509 -noout -text

SMTP with STARTTLS

openssl s_client -starttls smtp -connect mail.br0tkasten.de:587 </dev/null 2>/dev/null | openssl x509 -noout -text