Connecting with Tor
From Claws Mail FAQ
Tor (The Onion Routing) is a software and communication infrastructure providing users with the ability to access services anonymously. Tor can be easily used with Claws Mail in order to retrieve and send emails.
Install Tor
Install Tor (or the Tor Browser bundle) from torproject.org or install it via your package manager.
Configuration
Open the Preferences
window (Configuration -> Preferences
) and choose the Mail Handling -> Proxy
page.
Enable the proxy server and specify Tor's port (9050). The default hostname ("localhost") and the default proxy type ("SOCKS5") are correct.