How to fix the webmail error internal server error 500 user is over quota cpanel in linux reseller hosting?

First we need to know why the error “internal server error 500 user is over quota” is coming,user cpanel account reached disk quota limit and mail stopped working.When you are trying to login to your webmail it shows an error so we are not able to send and receive the mails.All mails are give error message.Make sure the email account and the cPanel account as a whole have sufficient space.If the email account, and the cPanel are both under the limits. To correct the issue it is necessary to increase the defined disk quota of the user account

If your email account is over its disk quota, you will not receive email as well. You can check your email account’s quota by logging into yourÂ cPanel and clicking theÂ Email Accounts icon. A list of email accounts will show, and next to each email account will be listed its quota and the actual amount of disk space that it is using. If it is over quota, delete email to free up space or click theÂ Change Quota link next to the email account and increase the disk quota available for that email account.Also note if you are getting any error kindly check the following details are correct at your end, so that we can avoid such type of email problem.

First you need to check with your email account’s basic configuration in your email client.
Also ensure that you are using your valid email address as your username and destination address.
Please ensure you are using the correct password. Your email password is the password you set when you initially created the email account within cPanel.

Kindly check with the above stpes at your end fix the webmail error internal server error 500 user is over quota and then try to sent the mails.