A company I work for will routinely send me messages encrypted by Proofpoint Encryption when they need to send me an attachment. I use Apple Mail and these messages refuse to load. When you click on the message it directs you to open them as a webpage. If I do this in Safari it loads a page and you have to login to read the message. Doing so crashes Safari. It gets a beachball and Activity Monitor shows it just eating memory (I've let it get to 4GB before I killed it one). If I open the page in Firefox I can login in successfully but the message has problems. None of the buttons work right. I can't access the attachment or do anything, just read the text. I've been a Mac user for 5 years and this is the first time I've ever come across something I honestly can't do that works without a problem on a PC.