To avoid problems during logging to your SMTP server you should make sure that your mail client has the correct settings and that you are using the correct email password.

More information on how to enable SMTP authentication for Mozilla Thunderbird, MS Outlook and Outlook Express is available in our tutorial here.

Another important thing is that you use the right password for your email account. If your mail client is set correctly and your SMTP server still rejects your password, we recommend resetting the password from cPanel -> Email accounts.

In our Email tutorial you can find detailed instructions for Email password change.

You can also check cPanel's video tutorial for additional information on how to use your mail with your web hosting account.