I’ve had this problem for a while, that Mac OS X Mail (the native mail client in OS X) sends emails that other email clients don’t recognize as attachments, but as embedded pictures. This has been really frustrating, because if I’m sending an image to a client that needs to be saved on the client’s computer, he or she is unable to do so because the image is not a “real attachment”.
So, here are the facts: Wether an image is embedded in the email or not, it’s still an attachment. Thus, OS X Mail does nothing wrong when it embeds the image, other clients simply doesn’t want to understand that it’s still an attachment. The clients (read: “Outlook”) offer no way to save the image other than to right click it inside the email, but that only generates a .bmp that’s scaled down to the email size in pixel width.
Please note that it doesn’t matter if you click the Attachment button in the main taskbar or simply drag the images to the email body.
The solution:
The reason my images were getting embedded was because I was using some signatures with colors in them. As soon as you set the font, a color or similar, Mail turns the email into a “Rich Text” email, which basically means it’s a HTML email. So when you attach images to such an email, Mail generates an tag for that image, thus embedding it into the email itself. You can avoid this easily by just using Plain Text emails (see screenshot).
You can also try to simply don’t use any formatting in the email, including your signature.
Hope this helps. 
26 Comments
January 7, 2009
Thank you. Thank you. Thank you.
January 7, 2009
You're welcome!
February 9, 2009
THANKS! SO SIMPLE BUT SO DIFFICULT
February 9, 2009
I know. Stupid Mail
February 18, 2009
Its taken me 7 months to get this right! My whole office is happy too! especially client service who uses pc
February 25, 2009
you're the man, great solution!!!
March 3, 2009
Thank you so much, very informative!
March 3, 2009
Here another problem, my sign with this configuration appear as attachment
March 24, 2009
Oh Thank God.. You da Man!
March 24, 2009
Oh Thank God.. You da Man!
March 29, 2009
test
July 23, 2009
Sometimes it’s really that simple, isn’t it? I feel a little stupid for not thinking of this myself/earlier, though.
July 23, 2009
Yeah, it's that simple
December 3, 2009
So helpful, Thank you
March 5, 2010
Ok, but clearly Microsoft has solved the problem of being able to have rich text and html emails that ALSO allow attachments to deliver properly, whereas MAC has NOT solved this problem effectively. I love MAC, but why haven't they set this up properly? I hate to see Microsoft solve something that MAC hasn't!
March 5, 2010
I'm 100% with you.
April 13, 2010
Hi
I found this solution, tried it and it works immediately.
"Mail.app by default displays images inline, and most email clients won’t recognize them as attachments. If you right click (or ctrl click with a one button mouse) on the image you can select to view the image as icon, which makes it behave like a normal attachment. To make this the default behavior you’ll need to use the Terminal to set the preference. Terminal is in Applications>Utilities. Open Terminal and type:
defaults write com.apple.mail DisableInlineAttachmentViewing -bool yes
That will make every attachment you send act like an attachment instead of a pretty unusable decoration."
This is from another user. See it here:
Disable Mac Mail.app Inline Image Attachments | Micah Gilman's Blog
I did it and it worked. I QUIT Mail after using Terminal, and then relaunched Mail, but did not need to restart the Mac.
May 19, 2010
This worked for me at first but now it is embedding jpgs and png files again and now it is squishing the embedded image. Has anyone else had this problem?
May 31, 2011
(No offense) The real issue is MAIL.
When sending an HTML email you can:
a- serialize an image and include it in the body.
b- add as an attachment.
Mail does (a) by default. This is not what people want in 90% of the time. (Outside the following uses cases: newsletter, spam, etc.)
In plain text email, you can only add a binary file as an attachment. No possible confusion.
June 17, 2011
The quickfix in Terminal:
defaults write com.apple.mail DisableInlineAttachmentViewing -bool yes will work in the beginning, then it will start to attach and squize the attachments into useless images. So Stick the to Plain Text solution!
September 13, 2011
Just a quick note – in LION its always weird squished emails
Even in plain text.
This is so annoying.
Apple seems to want us to choose a Microsoft product maybe:-)
December 28, 2011
Hi All, I’m testing Plain Text solution right now. Everything works fine as long as I’m not adding neither signature nor text. IN case of leaving signature even in Plain Text new message, everything’s screwed up again. So, easiest way for me is to convert them into PDF, as usually I want to add some text to the message.
Any other solution?
I’m using Lion and Mail.app 5.1 (1251/1251.1)
Regards.
Lech
December 28, 2011
Sorry, PDF conversion unfortunately is not a proper solution. Attachment might be just Saved as BMP … So… Any other idea?
Rgds.
Lech
December 28, 2011
… still experimenting and … When I’m adding more than 1 jpg to the Plain text New Message, it’s screwed. I mean attachments embedded and squizzed/deformed …
Please help …
Lech
December 28, 2011
… all of my previous posts relates to opening e-mails on PC in Outlook 2003. Sorry for not mentioning earlier.
Rgds.
Lech
December 28, 2011
New observation. I’m testing everything on MBP with Windows XP installed as virtual machine handled by Parallels Desktop 6. PDF attachments are accompanied by html files and cannot be easily open as PDF, just saved as BMP. But… on another PC running Windows 7 it works fine. I mean I can open them as a regular PDF (which are attached as regular attachments accompanied by HTML files, which cannot be open, it can, but showing empty page in internet browser) …
Lech