Make sure your user name and password is all lowercase.
Make sure you have created the email address in your control panel.
Change the user name to the full email address. Example:username@domainname.com
Still not working?
Change your incoming and outgoing mail servers from mail.yourdomain.com to the ip address listed in your welcome email.
If you can receive mail but aren't able to send this means one thing..... Your internet provider...
Either your domain is out of disk space, or your e-mail address itself is out. You will need to...
Login to your cPanel. (Click here to learn how to access your cPanel if you don't know how to)...
Log in to your Email Hosting account via this URL yourdomain/webmail Click on Settings Click...
Changing Email Password via webmail The password associated with your email account can be used...
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