![]() The first thing you’ll want to do is name the tunnel, which you can do under the “General” tab. Click on it to get information on the tunnel. ![]() The program will add a “New Tunnel” entry to the list of tunnels. To add a new tunnel, click on the “+” icon in the lower right of the window. Open the preference window for SSHKeychain and click the “Tunnels” icon. Here’s how we’d do the same thing using SSHKeychain and Apple’s own Mail program: It’s more complex to talk about than it is to do, really. The IP address 127.0.0.1 also works for this purpose. Then we’d configure our mail client so that instead of connection to port 110 of, it would connect to port 9110 of “localhost,” which is what computers call themselves for purposes of networking. So if we want to build a secure POP tunnel to a mail server called “,” we might use the local port 9110 to connect to port 110 on the POP server. All the traffic your e-mail program sends out is then passed securely over the tunnel and is then redirected to the correct target port on the server. To use the tunnel, you instruct your client software (an e-mail program in this case) to use the local tunnel port to communicate. To use one, you need an ssh login on the same machine where you download your e-mail.Ī typical tunnel is constructed of a local connection to a port higher than 1024 (because ports below 1025 are considered “privileged,” which means normal users can’t have access to them) that then forwards all traffic to a destination port on another machine. That’s where ssh tunnels can help you out. That means if you’re reading POP mail from a laptop on an unsecured wireless network, anyone with a packet sniffer can read the contents of your mail. All your mail goes over the local network and the broader Internet unencrypted. So in a common scenario with unencrypted POP3, when you go to download mail, your computer opens a network connection with port 110 on the mail server. Ports 995 and 465 are the most commonly used ports for encrypted POP3 and SMTP respectively. If you specify port 110 for POP3 or 25 for SMTP, the chances are good your traffic to those servers is unencrypted. You can tell if your POP3 or SMTP connections are encrypted most often by which ports you’re told to configure your e-mail client for. While authentication with those protocols may be encrypted, the traffic passing over them is often not. POP3 is a common protocol for receiving e-mail, and SMTP is how you send e-mail. Not sure what a particular term means? Check out the searchable PracticallyNetworked Glossary.
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