This is the v1 version, had the v2 before.

backend/move.go

@@ -0,0 +1,19 @@
+package backend
+
+import (
+	"github.com/emersion/go-imap"
+)
+
+// MoveMailbox is a mailbox that supports moving messages.
+type MoveMailbox interface {
+	Mailbox
+
+	// Move the specified message(s) to the end of the specified destination
+	// mailbox. This means that a new message is created in the target mailbox
+	// with a new UID, the original message is removed from the source mailbox,
+	// and it appears to the client as a single action.
+	//
+	// If the destination mailbox does not exist, a server SHOULD return an error.
+	// It SHOULD NOT automatically create the mailbox.
+	MoveMessages(uid bool, seqset *imap.SeqSet, dest string) error
+}