Step 1: Open Outlook 2007 Step 2: Click the Tools menu, and select Account Settings. Step 3: Click on the Email tab and click on the New… button. Step 4: Select Microsoft Exchange, POP3, IMAP or HTTP and click Next. Step 5: Check the Manually configure server settings or additional server types and click Next. [...]
The most common reason for this error is an incorrectly configured mail client. In order to solve this issue you should reconfigure your email client to successfully authenticate to the SMTP server.
You will need to increase the amount of disk space to receive mail again
First, please make sure the account is not hitting the quota limits placed on either the email account or the entire cPanel account.
The error appears similar to “AJAX Failure! I failed 3 times. Please refresh the page and try again.”
If you wish to check your email in your web browser securely, go to https://yourdomain.com/webmail/.
Email server unavailable for delivery. If the receiving server, domain, or mailbox name does not exist, then you will receive a bounce-back message (or possibly no message at all). If the receiving server is deferring or queuing emails (because it is too busy or broken), then it just depends on the mail system as to [...]
For both incoming and outgoing mail server, put : mail.yourdomain.com If mail.yourdomain.com is not working (perhaps because you recently changed your domain’s DNS), then you can replace it with the IP address or the hostname of the server which you are on. The incoming port number is 110. The outgoing port number is 26. These [...]
You can switch webmail programs as much as you like, and you will still see all your emails.
If you are getting this error, then too many people in your office are using the POP/IMAP mail client to send emails.

