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I need a command to connect to POP3 server, set startTLS, and get secure connection. I neet something to use like telnet. Is there any program that can achieve it?
--edit I'm just trying to write similar SMTP server, and I'd like to test in time handshake done by starttls. Is there something to help me?
oneat
Posted 2013-01-16T07:59:27.263
Reputation: 2 823
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Yes, you can use openssl to do this:
$ openssl s_client -crlf -connect mail.domain.com:110 -starttls pop3
This will initiate the session and get the certificate exchange going. You'll see the certificate exchange messages going back and forth, then the standard pop3 prompt:
+OK Hello there.
user username
+OK Password required.
pass passw0rd
+OK logged in.
list
+OK
Paul
Posted 2013-01-16T07:59:27.263
Reputation: 52 173
is there a way that client doesn't authenticate on start, but when I type starttls? – oneat – 2013-01-16T10:12:48.190
@oneat Not that I know of, can you add more detail to your question about what you are trying to achieve and it will help focus the answers better – Paul – 2013-01-16T10:22:19.633
usually ssl starts when starttls is supplied, but in your example it's supplied instantly (as I understand). I want to write starttls by myself to server and not to be written by opensll. – oneat – 2013-01-16T10:26:09.747
@oneat Yes, I understand that from your previous comment, it would be helpful if you could edit the question to add more detail about what you are trying to do. – Paul – 2013-01-16T11:06:27.953
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Isn't it easier to just set up whatever connects via POP3 to use SSL/TSL in the first place? Better use IMAP if you can, the protocol is much more robust and moreover efficient
vonbrand
Posted 2013-01-16T07:59:27.263
Reputation: 2 083
If you are writing an SMTP server, it would only take a few minutes to knock up a client to interact with it. – Paul – 2013-01-17T20:52:58.213