pop-up blockers stopping .eml attachments

We have a diverse population here at my University and a great deal of user skill. One issue that is popping up (no pun intended) has to do with emails forwarded as attachments.

When a user gets an email as an attachment they see the .eml file and can click on it to open, however FF and IE will block this as a pop-up. Not all of our users see the pop-up notification so they call the help desk. This does not occur on other new windows just the attached email files.

I don't see this as a bug anywhere, and other webmail programs will detect blockers and prompt the user to disable them.

Is this fixed beyond 5.0.6?

I am having problems with firefox blocking the same type of pop ups. I opened the email, the attachments worked, I had to reprint one of them (literally a moment later) and now I am getting a 'oops! pop up browser block'
there is an exception made for this page already and I tried deleting and reading the exception. no dice.

Unfortunately I do not have a resolution but I do know that the pop-up blocker issue does not occur in IE 7 but does in IE 8 - so maybe someone who has a lot more knowledge than I can figure something out with that info.