We're using Office365 for mailing and recently our clients have told us they were getting error messages when sending us emails. The error messages tell them their email could not be delivered cause the recipient mailbox is full. However we're properly recieving every single email anybody sends us and none of our mailboxes are actuall full. We've checkend and actually none of them is bigger than 26GB and the limit is 50GB as far as I know. Is this a bug? Have anyone faced this issue before? It's really annoying cause eveyone is recieving these error messages whenever they're trying to send emails to any of our mailboxes.