What type of files are attached in the email (in the email, the the "Attachments" field click the ▶ so that it points downwards) - what is the file "extension"?MacBook 2.4 White, iMac Intel 2.16 20", PowerMac G4 MDD, Macintosh Plus, Mac OS X (10.6.6)
Photos were included in the email but not as an attachment; I was able to drag them on to the desktop and attach them to an email. But not able to just forward them.
GHaluminum imac, Mac OS X (10.6.1), intel aluminum iMac
Seems that the images were embedded in the email you received, possibly via a web-based email message? Seems strange that you are being told you have a missing plug in though.
Still, [this link|http://reviews.cnet.com/8301-13727_7-20013991-263.html] should solve your problem.
Let me know if it works.MacBook 2.4 White, iMac Intel 2.16 20", PowerMac G4 MDD, Macintosh Plus, Mac OS X (10.6.6)
In most cases this is just a transient problem and it doesn't mean that the message is corrupted. Try relaunching Mail and opening the message again. You can also always save the attachments using the button just below the headers of the message and then open them in Preview or some other application.
Some people have told me that the Java settings (see the above link provided by Zlig) helped them, some told me that it didn't change anything. I work with attachments a lot and have been encountering the problem randomly since Mac OS X 10.5 or 10.4: fiddling with Java and other Internet/WebKit or Mail plug-ins hasn't had any effect.
I just recently disabled Java system-wide via the Java Preferences app and begain noticing this problem shortly thereafter.
Enabling Java again/Restoring Defaults via the app solved the problem.
Although, now I'm again running an older, less secure version of Java with Leopard.
Pick your battles.