Starting 21 June, ICTS blocks .zip, .htm and .html attachments in emails coming from outside the UM Exchange environment, since they are common attack vectors for phishing and malware.
This may impact the exchange of these types of files with external contacts.
If you need to send and/or receive .zip, .htm and .html files to/from external contacts, there is an alternative, in the form of the SURFfilsender (not to be confused with the SURFdrive).
In case your contact is not affiliated to SURF, you can still provide Guest access to them by following the instructions given after you login.
If you need help on the SURFfilsender, you can contact the ICTS Servicedesk via 85555 or servicedesk-icts@maastrichtuniversity.nl.