Claws and Tor shouldn't warn on StartTLS connections to port 110 (POP3) and 143 (IMAP)
If you try to configure a Riseup account with StartTLS as documented by them https://help.riseup.net/en/email/clients, Claws (or maybe Tor actually) warns you about:
One of your applications appears to be making a potentially unencrypted and unsafe connection to port 110.
Which is unnecessarily scary as this connection is fine.
Training people to click through security warnings like this is not good.
Feature Branch: bugfix/9327-disable-starttls-warnings