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Today I opened mail.app and my mail attachments showed up as "missing plug-in". I faced this issue before, at that time I quite the mail.app and opened again were fix the problem. Now that also not working.Please help me to fix this issue.

The Following are the content types in the mail:

Content-Type: multipart/alternative; 
Content-Type: multipart/related; 
Content-Type: text/html; charset="us-ascii" 
Content-Type: image/gif Content-Transfer-Encoding: base64 
Content-Type: multipart/related; 
Content-Type: text/html; 
Content-Type: image/jpeg   Content-Transfer-Encoding: base64

This is how my mail look like:

enter image description here

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Might be something to to with java. See these pages for more help: hints.macworld.com/article.php?story=2010062323063622 discussions.apple.com/thread/2462812?start=45&tstart=0 –  IconDaemon Dec 11 '12 at 20:31
    
Can you add a screenshot of the message where you see "missing plug-in"? –  jaume Dec 13 '12 at 10:22
    
@jaume if you give your mail id i can forward that mail. –  Shineeth Hamza Dec 18 '12 at 8:02
1  
I fully understand, I just wanted to keep it simple... Please search 'Content-type:' and paste everything from the first match to the end of the message. –  jaume Dec 18 '12 at 11:39
2  
@ShineethHamza Plus, I cannot see "Missing plugin" in that screen shot. –  Shane Hsu Jan 18 '13 at 8:27
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3 Answers

in general Mail plug-ins were saved in ~/Library/Mail. The following steps are actable for OS 10.7 and later versions only.

The folder mentioned above is hidden and can be accessed by clicking "Go" in the Finder menu bar while pressing one of the alt-keys. In ~/Library/Mail drag all objects except the V2 folder to desktop and restart Mail.

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The OP is not talking about a Mail.app plugin. –  Zo219 Dec 16 '12 at 3:13
    
@praepersonal if I try this, will I loos my mails? –  Shineeth Hamza Dec 17 '12 at 12:35
    
@praepersonal there is nothing other than V2 folder. –  Shineeth Hamza Dec 18 '12 at 7:45
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I just had a similar problem and solved it by going to:

System Preferences > Java > Security

and set the security level down to medium.

However I don't find this a very satisfying solution and I wonder why Mail requires Java to display images...

Update:

I assume it actually has nothing to do with Java itself but in some way with the plug-in loading. Maybe changing Java settings does something with the internet plugins... After all, now that my images do appear again, it has no further effect to change the java settings. The images will be displayed regardless of the java security settings. (So I set them back to high)

Maybe another solution is to have the privileges repaired or internet caches cleaned up...

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Why does java affect jpeg inages? –  Mark May 15 '13 at 13:57
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I had this problem in OS X 10.8.5 and the solution was to quit and restart Mail.

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