iPhone and iPod touch: Email account setup

Summary
Mail is a rich HTML email client on iPhone and iPod touch that works with the most popular email systems including Yahoo!, Gmail from Google, AOL, and MobileMe from Apple in addition to most industry-standard POP3, IMAP, and Microsoft Exchange email systems. Mail lets you send and receive photos and graphics, which are displayed in your message along with the text. Mail also allows you to view PDF, Microsoft Word, Excel and other attachments on iPhone or iPod touch.

Products Affected
iPhone, iPod touch, iPhone 3G

Setting up email accounts
Email account setup with Mail is easy. If you're setting up an email account for the first time on iPhone or iPod touch, simply touch the Mail icon on the Home screen. If you're adding an additional account with software version 2.0 or later, touch the Settings icon on the Home screen, select Mail, Contacts, Calendars and select Add Account.

If you're setting up a Microsoft Exchange, MobileMe, Gmail, Yahoo! or AOL account, touch the icons for those services on the Add Account screen and enter your account information. If you're setting up an email account from another provider, select Other. In software version 2.0 or later, Mail can automatically setup many popular POP and IMAP email accounts using just your email address and password. As Mail looks up settings that match your email account you may see a note appear that will describe any limitations you may experience in using your email account. If Mail cannot find the settings needed to setup your email account, refer to the documentation from your email provider on how to manually setup an email account. 
* Your email address
* The email server type (POP3)
* The Internet host name for your incoming mail server (mail.yourdomainname.com)
* The Internet host name for your outgoing mail server (mail.yourdomainname.com)
* Your user name and password for incoming and outgoing servers (this will be your entire email address 'user@yourdomainname.com' and will apply to both incoming and outgoing servers.)

Syncing email account settings to iPhone or iPod touch
You use iTunes to sync your email account setttings to iPhone or iPod touch. iTunes supports Mail and Microsoft Entourage on a Mac, and Microsoft Outlook (2007 or 2003) and Outlook Express on a PC. See article "Syncing iPhone and iPod touch with your computer" for further details.

Note: Syncing email account settings to iPhone or iPod touch copies the email account setup, not the messages themselves. Whether the messages in your inbox appear on both iPhone or iPod touch and your computer depends on the type of email account you have and how it’s configured. You may need to enter your password on the device after syncing account settings.

[Taken from Apple]