On Tue, Feb 24, 2015 at 08:03:14PM +0100, Marco Fioretti wrote:
> To Viktor: that how do I check what mechanism are being offered by the
> receiving machine? I want to check that just for completeness
Since you need to see the EHLO reply after STARTTLS:
1. (OpenSSL command-line utility)
$ openssl s_client -starttls smtp -connect smtp.example.net:587
<you type>
EHLO client.example
QUIT
2. (Postfix 2.11 or later, optional posttls-finger utility):
$ posttls-finger "[smtp.example.net]:587"
3. A popular SMTP test client is "swaks".
--
Viktor.
