testing starttls on mail servers from shell
Submitted by ramez hanna on Mon, 11/10/2008 - 12:35
This is a simple way to test if your server is able to do STARTTLS or not
openssl s_client -starttls smtp -crlf -connect your.mail.server:25
it should printout a bunch of TLS stuff and then you have the same smtp shell you get normally with telnet
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