Imports git.maildev.jp/tachibana/go-message/message/ximap/go-imap git.maildev.jp/tachibana/go-message/message/ximap/go-imap/backend git.maildev.jp/tachibana/go-message/message/ximap/go-imap/backend/backendutil github.com/emersion/go-message Standard library imports bytes errors io/ioutil time