We have been receiving email newsletters from a particular domain without incident for quite some time now (at least a few years). Recently this newsletter is being rejected with the SMTP error of "552 Requested mail action aborted: exceeded storage allocation". We receive other email newsletters from this same sender without incident, but this one particular newsletter keeps getting rejected by our Exchange Server. As far as I am aware, this is not happening to any other emails that we are supposed to be receiving. Any ideas on what could be causing this?
