code: @SuppressWarnings("rawtypes")
  	private MailInboundChannelAdapterSpec getImapFlowBuilder(URLName urlName) {
  		return Mail.imapInboundAdapter(urlName.toString())
  				.shouldMarkMessagesAsRead(this.properties.isMarkAsRead());
  	}
docs: Method to build Mail Channel Adapter for IMAP.
  @param urlName Mail source URL.
  @return Mail Channel for IMAP