Visit Gmail and click settings (should be in top right corner). Select Forwarding and POP/IMAP.
- If you want to use POP, select either “Enable POP for all mail (even mail that’s already been downloaded)” or “Enable POP only for mail that arrives from now on”.
- If you want to use IMAP, select “Enable IMAP”.
Open Evolution from Applications -> Internet -> Evolution Mail. If no mail account has been created before, a mail account setup wizard will automatically be opened. Otherwise open it from Edit -> preferences -> Mail Accounts -> Add. Click Forward. Enter your email address for Gmail (including @gmail.com). Click Forward.
– If you have enabled POP from Gmail set “Server Type” to POP, “Server” to pop.gmail.com, and “Use Secure Connection” to “SSL encryption”.
– If you have enabled IMAP from Gmail, set “Server Type” to IMAP, “Server” to imap.gmail.com, and “Use Secure Connection” to “SSL encryption”.
Click Forward. Click Forward. Set “Server” to smtp.gmail.com, and “Use Secure Connection” to “SSL encryption”. Click Forward. Click Forward. Click Apply.
More about Evolution here
Source: Ubuntu Guide