Last updated on May 5, 2021

Desktop email clients, such asThunderbird andClaws Mail, are preferred over their web counterparts by many professionals and power users due to their additional convenience and security. However, one big downside is that they often expose the sender's IP address to the receivers, since many SMTP servers record the sender's IP address and put it in the header, something similar toReceived: from [xxx.xxx.xxx.xxx] (my.example.com. [xxx.xxx.xxx.xxx]). This, unfortunately, puts the sender's privacy in great jeopardy, as an IP address can reveal so much information including location, ISP, and institution names.

To address this issue, one simple solution is to let the email client connect via a proxy. While a system-widely available proxy works for many users, some of us just want our email clients, but not other programs, to go through a specific proxy. In this post, I'll demonstrate how to use an email client automatically via SSH tunneling. The instructions are specifically tailored for GNU/Linux and MacOS users, as it involves some uses of UNIX commands and bash scripts; if you are on Windows, you can still follow the instructions with the help ofCygwin.

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Last updated on October 11, 2018

If you have multiple ssh keys, it is sometimes hard to manage. This waswritten before, but mostly they are handling using different keys with different host. What if you have two or moreGitHub orBitBucket accounts requiring different keys? As a result, I createdskm to provide a more general solution. Here I’ll give a brief introduction of how to manage multiple SSH private keys with skm.

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