I quite often need to copy and paste someone’s email address from an email inside Apple Mail. If you do this by right-clicking on someone’s email address like firstname.lastname@example.org and copy it, then paste it into another application it will show up as “Richard Mallion <email@example.com “, which can be fairly annoying if you just want the email address.
Help is at hand with the terminal. You can change this behaviour so that only the email address is copied.
To do this, launch Terminal and paste this line into the command line:
defaults write com.apple.mail AddressesIncludeNameOnPasteboard -bool false
Then relaunch Mail app for the changes to take effect.