Incoming mails are forward to a predefined storage facility, see target .
This class offers the functionality to detect the completion of storing the last mail which came in via pop3Client and act upon that, via command . This operation scans all known mail folders for new mail which is then displayed. Without that ExMH would have to poll every so often to be up to date. The handle of the storage facility to forward incoming mails to. The command to evaluate after the storing of the last incoming mail completed.