Usually contacts could be entered in the To or Cc or Bcc address and would autocomplete. With macOS 15 this is no longer the case. I still can use the + button on the end to select contacts but this is odd. Autocomplete only works with previous recipients.
Edit: Had to restart Mail and changed a system setting. Now it works again.
Edit: Had to restart Mail and changed a system setting. Now it works again.
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