Hello,
If your email is hosted by EarthLink Business the IMAP settings are:
incoming server name: imap.earthlinkbusiness.com
incoming server port: 143, or 993 + SSL required
incoming username: your complete email address
incoming password: your secret email password
The SMTP server settings for EarthLink Business are:
outgoing server name: smtp.earthlinkbusiness.com
outgoing server port: 587, or 465 + SSL required
Both ports 587 and 465 require authentication using the same username and password as your incoming mail server settings.
Please note: IMAP service is not available yet for earthlink.net email addresses, but if you
reply here you will be notified when IMAP is available for earthlink.net accounts.