I find this is the problem of the mail service provider, sorry for waste your time.
▶ mbsync -a -D isync 1.5.0 called with: '-a' '-D' Reading configuration file /home/ploki/.mbsyncrc Notice: SSLType is deprecated. Use TLSType instead. merge ops (in Channel 'wanshiwen@yeah.net'): common: OP_EXPUNGE,OP_CREATE far: XOP_HAVE_EXPUNGE,XOP_HAVE_CREATE near: => far: OP_EXPUNGE,OP_CREATE,XOP_HAVE_EXPUNGE,XOP_HAVE_CREATE => near: OP_EXPUNGE,OP_CREATE channel ops (wanshiwen@yeah.net): far: near: Channel wanshiwen@yeah.net Opening far side store wanshiwen@yeah.net-remote... F: [ 1] Enter connect_store...
Support for utf-7 doesn't work well