If you really want to get crazy about it, use TOR or set up an SSL server somewhere using something like Amazon Web Services.
In the mean time, here are some simple little things you can do to try to prevent your ISP spying on your files and prevent those letters from coming in. We will do this two ways, once using the web client and once with the command line
Note: I would also recommend using VPN or a proxy but we won't go into that.
And if you are on a college network, you should definitely consider enabling LPD.
Editing Transmission Options Using the Web AppGo to the appropriate transmission web page. If you don't know this. See below:
Click the wrench to open up the options. Then change require encryption to true and click enable blocklist. You can pick whichever blocklist you want but I use the following blocklist:
Simply paste that in the box as shown below and you are ready to go.
Editing Transmission Options Using the Command LineOpen up your terminal and stop transmission by typing:
sudo service transmission-daemon stop
then edit the settings file by typing:
sudo nano /etc/transmission-daemon/settings.json
Change the following settings:
Then simply start transmission again with the command:
sudo service transmission-daemon start
To automatically download things and use your transmission to your fullest potential, see this page.
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