Would Exceed Mailbox Quota?

When the mail server sends an "Over Quota" warning message it means your mailbox has or will soon exceed its default email account space limitation. ... Log in to your webmail and remove delete mail from the sent items/inbox and then remove them from the deleted items.

What happens if you exceed your email quota?

When your account is over quota, two things may happen: Your email provider will reject email sent to you, since you have no more of their disk space available to store it. Usually the provider will send a bounce message to the sender, saying the mail could not be delivered.

How do I fix my mailbox quota exceeded?

First, you could simply delete some of your emails. Deleting emails in your email client will remove them from the server and lower the space used. If you have any emails with large attachments, deleting those will free up space. You could also raise the quota of your mailbox.