I've got a user who's getting a lot of these all of the sudden. Here are some of the xml attachments:

e4cc9d94-59bd-4f4a-b529-5cc1ef923cd20_16270f44a3306ff6585b87d71c7ad89f75f0 ef49_69643d33363a65346363396439342d353962642d34663 4612d623532392d3563633165663932336364323b6578703d3 1333a313234383632363931313839333b747970653d363a7a6 96d6272613bsoap:Sendermailbox exceeded quota of 1073741824 bytesmail.QUOTA_EXCEEDEDbtpool0-9785:1248455052471:561497c5b8a0dca41073741824
e4cc9d94-59bd-4f4a-b529-5cc1ef923cd20_16270f44a3306ff6585b87d71c7ad89f75f0 ef49_69643d33363a65346363396439342d353962642d34663 4612d623532392d3563633165663932336364323b6578703d3 1333a313234383632363931313839333b747970653d363a7a6 96d6272613bsoap:Sendermailbox exceeded quota of 1073741824 bytesmail.QUOTA_EXCEEDEDbtpool0-9776:1248454877877:561497c5b8a0dca41073741824
e4cc9d94-59bd-4f4a-b529-5cc1ef923cd20_16270f44a3306ff6585b87d71c7ad89f75f0 ef49_69643d33363a65346363396439342d353962642d34663 4612d623532392d3563633165663932336364323b6578703d3 1333a313234383632363931313839333b747970653d363a7a6 96d6272613bsoap:Sendermailbox exceeded quota of 1073741824 bytesmail.QUOTA_EXCEEDEDbtpool0-9783:1248454877797:561497c5b8a0dca41073741824