How can I get Gmail notification in my indicator applet (without leaving Evolution open)?

Gmail Notifier is probably the best option for what you are trying to accomplish.


I use CloudSN (Cloud Services Notification). It supports gmail, google reader, pop3, imap, twitter, identi.ca

http://chuchiperriman.github.com/cloud-services-notifications/ (PPA available)

The best part is that it supports multiple accounts.

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I've had good luck with CheckGmail. Has a nice GUI, cool toaster popups, and allows you take actions on emails from the tray.

sudo apt-get install checkgmail; checkgmail &

Check out GMailWatcher. It is still in early development stage, but works quite well. I am using it for over a month now. Recommended.

Introductory Blogpost: owaislone.org/blog/2010/jul/gmail-watcher
Launchpad URL: https://launchpad.net/gmailwatcher

PPA

$ sudo add-apt-repository ppa:loneowais/ppa 
$ sudo apt-get update && sudo apt-get install gmailwatcher