Remove attachments in Mail: Apple Support Communities
Looks like tinoberlin found the solution. Another suggestion is to rebuild the mailbox.
Alright, editing the .emlx file in the directory /Users/Username/Library/Mail/V2/Mailboxes using TextEdit seems to be the only way to remove attachments from any email. You open the email, delete everything below your message, save it, close Mail, re-launch Mail, and the attachment has gone.
via Remove attachments in Mail: Apple Support Communities.






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