whenever I try and download any email attachment, I get the following error: Unable to Download Attachment Unspecified error: 1310 -

Under show error details, it gives me the following:

Error code 1310: http error 403


I have turned off logging and I have installed preware / govnah / uberkernel etc.; but I don't think that is the issue.

does anyone know why this is and how to fix it?