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Sometimes, your mailboxes do not receive new emails and senders receive an error message stating "mailbox is full: retry timeout exceeded". Usually, this error takes place when you reach to mailbox quota limit.

Windows Shared Hosting customers can increase their mailbox quota (under limit of 2 GB per domain) from WebsitePanel by following tutorial.

Increase the Mailbox Quota from WebsitePanel

If you are Windows VPS customer, you should refer to following articles to increase the mailbox quota.

Increase the Mailbox Quota from WebsitePanel
Increase the Mailbox Quota from SmarterMail


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