Permalinks need to have the option to always include proxy info
Our faculty work sometimes from campus and sometimes from home and send permalinks to students who may be on or off campus. The permalinks will only consistently work if they are proxied all the time. Our faculty or students are not going to think to check the URL every time...mainly because every other vendor we use just allows us to turn on proxied version 100% of the time regardless of where they are when they are accessing the resource so they don't have to think about it.
Catherine O'Sullivan commented
Our permalinks include our proxy information. I think it was part of the initial setup information we gave to ProQuest.