Building an IMAP connection manually with telnet
Connect: . login USER PASSWORD
List all folder: . list "*" "*"
Select a folder: . select inbox
List messages: . search all, . search new, . search deleted, ...
Fetch a message: . fetch 1 rfc822
Mark a message for deletion: . store 1 +flags (\deleted)
Really delete marked messages: . expunge
Quit: . logout