backported some code from lang_de branch

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

src/main/java/de/srsoftware/widerhall/mail/ImapClient.java

@@ -156,6 +156,7 @@ public class ImapClient {
             var days = duration.toDays();
             LOG.info("Message {} is {} days old!",message.getSubject(),days);
             if (days > holdTime){
+                LOG.info("…removing");
                 Folder folder = message.getFolder();
                 if (!folder.isOpen()) folder.open(Folder.READ_WRITE);
                 message.setFlag(Flags.Flag.DELETED, true);