Fetchmail setup fingerprint error

[chienchou.pan]

HI

    I want to use the plugin "Fetchmail", when I setup mailbox in fingerprint, it always show＂text validation error＂　and could't save. what's wrong? 

    I get the ssl fingerprint use below command, Is it any problem?

openssl s_client -connect $SERVER:$PORT -showcerts | openssl x509 -fingerprint -noout -md5

MD5 Fingerprint=35:20:B2:05:B8:AF:B4:7A:FB:77:A0:4D:D1:86:75:61