On 10 Mar 2014, at 9:06, soumya tr wrote:
But telnet <hostname> 465 just quits when I enter EHLO:
that's because it's configured for TLS on connect - which means you need to be 'talking' TLS straight away. (As opposed to 587, which requires a step up from plain SMTP to TLS with "STARTTLS")
try using the openssl command line tool, with "openssl s_client -connect <hostname>:465". Then you'll see the standard SMTP banner.
If you want to test 587, openssl s_client has a -starttls option that makes it easy: but you need to also specify the protocol (try "openssl s_client -starttls smtp -connect <hostname>:587"
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