What are some alternatives?
When comparing PopTrayU and nPOPuk, you can also consider the following products
POP Peeper - POP Peeper is an email notifier that runs in your Windows task bar and alerts you when you have new...
Mia for Gmail - A desktop email client for your Mac, without a browser !
Kiwi for Gmail - Dedicated Gmail client with clean integration of Google Calendar, Contacts, Google Drive, and...
Google Mail Checker - Displays the number of unread messages in your Google Mail inbox.
Gmail Notifier Pro - Gmail Notifier Pro is a Gmail notifier for Windows that can check multiple Gmail accounts for new mail and display notifications. Also supports Google Calendar, Google Reader & Google News.
PopMan - PopMan is a POP3 and IMAP4 manager.