Get mails from remote machine via SSH

[.]

Hello,

My server-side setup can be found here [1].

I'd like to read/write mail from another machine (it doesn't have a
public ip). I'd also like to store it there.

I found this guide [2] (SSH / getmail part). I tried to use it but it
didn't work out.
Could you help me? (I'm not familiar with sh.)

How to automatically delete all mails from the server after the
mentioned SSH-sync?

[1] 
https://groups.google.com/group/gnu.emacs.gnus/browse_thread/thread/013fd87d1f1238ac
[2] 
http://www.gnu.org/software/emacs/manual/html_node/gnus/Mail-Source-Specifiers.html#Mail-Source-Specifiers

Thanks