Here are some checks you can make in order to locate the reason why you cannot receive email with your Outlook:
Check your mail server connectivity
The standard server ports used for receiving emails through POP3 or IMAP protocols are port 110 and port 143 respectively. If you have problems receiving emails, we recommend that you perform a telnet check of the connection between your computer and the appropriate port depending on the email protocol your Outlook is set to use for receiving emails. For detailed instructions how to check your connection to port 110 or 143 with the most popular OS, you can refer to our IMAP or POP3 refuses connection article.
If the connection test shows server side problems, we would have already been notified by our automatic monitoring system and the problem will be most probably fixed within the next few minutes. If the test shows no problems with the connection, you should investigate the other reasons described below.
Use the correct Mail Client settings:
Incoming mail server (POP3/IMAP server): mail.yourdomain.com
Outgoing mail server (SMTP server): mail.yourdomain.com
Username: the full e-mail address like firstname.lastname@example.org
Password: If you are not sure what your email password is we strongly recommend that you reset it from your cPanel > Email Accounts.
In our Email tutorial you can find detailed instructions for Email password change.
Check Email Quota
If you have exceeded the quota of your email account, you will not be able to receive any more email messages. You should either remove some of the old messages or increase the space quota of your email account.
You can check each account's disk usage from:
cPanel > Email Accounts > Current Accounts section. In the table there is a column called Usage which gives information about the space usage of each mail account.
To change the quota of an account, click on:
cPanel > Email Accounts > Current Accounts > Functions column > Change quota.