Added workaround for Migadu

app/src/main/java/com/sun/mail/imap/protocol/IMAPProtocol.java

@@ -1670,8 +1670,13 @@ public class IMAPProtocol extends Protocol {
      * @see "RFC2060, section 6.4.2"
      */
     public void close() throws ProtocolException {
-	simpleCommand("CLOSE", null);
-    }
+		try {
+			simpleCommand("CLOSE", null);
+		} catch (CommandFailedException ex) {
+			if (ex.getMessage() == null || !ex.getMessage().contains("Mailbox is read-only (opened with EXAMINE)")) // Migadu
+				throw ex;
+		}
+	}
 
     /**
      * EXPUNGE Command.