PopTrayU is described as 'Have you fallen in love with the fabulous email notifier program Poptray, but you're running a newer version of Windows than PopTray was designed for? Now there's a new option. Developer Jessica Brown has built upon PopTray to create PopTrayU!' and is an app. There are more than 10 alternatives to PopTrayU for a variety of platforms, including Windows, Linux, Opera, Mozilla Firefox and Mac apps. The best PopTrayU alternative is POP Peeper, which is free. Other great apps like PopTrayU are Notifier for Gmail, Mia for Gmail, Magic Mail Monitor (MMM) and Gmail Notifier (gmailnotifier.com).
POP Peeper is an email notifier that runs in your Windows task bar and alerts you when you have new email on your POP3, IMAP (with IDLE support), Hotmail\MSN\LiveMail, Yahoo, GMail, Mail.com, MyWay, Excite, iWon, Lycos.com, RediffMail, Juno and NetZero accounts.
Gmail™ Notifier is an open-source project that notifies you about incoming emails from all your Google Mail accounts and labels.
Magic Mail Monitor (MMM) is a free POP3 mail monitor with multiple accounts support. It sits silently in your system tray, and notifies you about new messages in your mailboxes. Then you can preview messages and delete unwanted mail in order to avoid spam and viruses.
Gmail Notifier alerts the users of new email messages. Users can also read emails, delete or mark them as read, all without having to open a browser.
Gmail™ Panel (and Notifier) is an easy-to-use extension for your browser, which can help users to keep track of their Gmail account, while surfing the internet for other information. This convenient extension can help multitaskers as they have the opportunity to open their Gmail...
GMDesk is an application that lets you run Gmail, Google Calendar, Google Docs and Google Maps as a stand-alone application to do all your mail handling, calendar event reading etc with. No need to open it up in a web browser, or have it clutter your workspace.
PopTray started as a little POP3 mail checker I wrote, because I couldnt find a freeware program that had all the features I wanted. Since then, new features have been added by request. After years of refinement PopTray 3.
Gmail Notifier is a Linux/Windows alternative for the notifier program released by Google, it is written in Python and provides an attractive and simple way to check for new mail messages.
Fastest Gmail is a handy and reliable extension designed to notify you about incoming emails from all your Google Mail accounts and labels.
Gmail™ Notifier Plus alerts you of new email messages. Users can also read or reply to emails, delete or mark them as read, all without having to open a new window.
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PopPeeper is an excellent alternative. UNLESS you need the ability to call external programs upon new mail. This feature - according to the dev - will arrive in v6.x. It's not free, but development and keeping up to date with the security of modern webmail, is probably expectable