Sylpheed is a lightweight email client you could use on a USB stick. With Sylpheed you always have your own e-mail program and all your email available wherever there is Internet access . You can create multiple accounts and you can read your messages in discussion form. It is a program that you lets you manage your email in an orderly manner. For those who want there is an extensive range of options. Personally, I prefer using an email client that also can display HTML and Sylpheed that cannot. For those who don’t need that Syplpheen is an excellent program.
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