You may already know that you can easily sign or markup PDFs in Apple Quick Look and Preview. But did you also know that you can do this directly within Apple Mail?
The process is quite simple; reply to the message that contains the PDF then click the arrow at the top-right of the PDF and select "Markup". Make any necessary changes and click "Done", then send the email.
Related:
Add your signature to PDFs on Mac View and edit files with Quick Look on Mac
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