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howto setup, test, spamcheck, …
port 25:
telnet example.com 25 Trying 88.88.42.23... Connected to example.com. Escape character is '^]'. 220 example.com ESMTP ehlo testing ...
you should receive some STARTTTLS auth lines.
check cert:
openssl s_client -starttls smtp -crlf -connect synoptx.net:25