POP3 APOP # Server-side CAPA APOP REPLY welcome +OK curl POP3 server ready to serve %LT1972.987654321\@curl%GT From: me@somewhere To: fake@nowhere body -- yours sincerely # Client-side pop3 crypto digest POP3 APOP authentication pop3://%HOSTIP:%POP3PORT/%TESTNUMBER -u user:secret # Verify data after the test has been "shot" CAPA APOP user 7501b4cdc224d469940e65e7b5e4d6eb RETR %TESTNUMBER QUIT