Open your Account.stg file with text editor in foxmail mail account folder.
Find the hex encypt password line in the file. Just like
XXXXPassword=DEADBEEF......
Decrypt hex encypt password with foxmail-decrypt
> .\foxmail-decrpyt.exe
Usage of foxmail-decrpyt.exe:
-p string
hex encrypt password
-v6
password from foxmail 6
> .\foxmail-decrpyt.exe -v6 -p 61D05ABC4CFB32CB410C5AFF
smtppass123
build binary
> go build .\cmd\foxmail-decrpyt\