Created
November 11, 2014 17:38
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| # mail.example.com should be one of the results of a `dig +short mx example.com` | |
| # Note that your provider might block all port 25. | |
| # If STARTTLS header is missing or mangled, but https://starttls.info/ shows example.com as supporting STARTTLS, | |
| # there might be a downgrade going on. | |
| (echo EHLO foo ; sleep 3) | nc mail.example.com 25 |
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