Like any other form of communication, its not just an email's content that's important, but also the other information they contain, including email addresses and names, subject, headers, and other metadata. This information can come useful in many circumstances, but most email apps hide it in order to keep everything simple and clutter-free.
Mail Clips is a free Mac app available in the Mac App Store that lets you copy this information from a selected message in Mail. You can copy the complete text in a message, its subject, the sender and recipients’ email addresses, their names, the header message and ID, the date and time it was sent on, and the HTML source of an email. It can also save a message in PDF and RTF format, and add the sender and recipients to your address book. While you can do all of this from the Mail app by opening an email, selecting the information and then copying it manually, Mail Clips offers you the short way around.
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