I am a BIG fan of Google’s Gmail service. It has the best webmail interface by far and offers nearly unlimited storage. Now that Gmail allows IMAP access I am using it as my primary email service on the iPhone. I’ve configured Gmail to check all of my other email addresses via POP3. This is not only convenient since I have access to all of my email in one location, but it also reduces the amount of spam I see since the Google spam filter is very good. Note that you will need to maintain a list of contacts in Gmail to prevent real mail from being accidently labeled as spam. I use Google Sync to keep my iPhone contacts in sync with my Google Contacts. Continue reading to learn about the ideal settings for using the iPhone with Gmail via IMAP.
If you aren’t familiar with the POP3 and IMAP protocols, read this.
Enable IMAP Access
Before we begin you will need to enable IMAP access from inside your Gmail Settings ⇒ Forwarding and POP/IMAP panel.

Setup Gmail IMAP in the iPhone
Follow these instructions to configure the iPhone to access Gmail. In short, your settings should look something like the following.
- Incoming server: imap.gmail.com
- Outgoing server: smtp.gmail.com
- Authentication: USERNAME (from USERNAME@gmail.com) + your password
Enable Advanced IMAP Settings in Gmail
Within Gmail’s web interface, go to Settings ⇒ Labs and enable the Advanced IMAP Controls:

Now open ‘Edit Labels’ and make sure that the Sent, Drafts, and Trash mailbox show up in IMAP (see below):

Modify iPhone Mail Settings
Now open Settings ⇒ Mail, Contacts, Calendars ⇒ Gmail (or whatever you named it) ⇒ Advanced, and configure mailbox behaviors. In short, you want to change the folders for Drafts, Sent, and Deleted Mail to the corresponding folders located below [Gmail] (see below):
Flagging Messages
Unfortunately there is still no way to flag messages within the iPhone interface.
You can, however, view flagged messages in the [Gmail]/Starred folder.
Leave me a comment if you know of a good Gmail/iPhone tip that I haven’t mentioned.

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