weird behaviour of Apple Mail on desktop
On my desktop (MacMini mid 2011, running 10.13.6) I have recently received a couple of emails in Apple Mail from Freecycle.org which actually contain mails from different senders. If I try a reply it opens a new mail with the displayed (wrong) email address. The email contains a lot of text encodings so is not displaying correctly. If I go to my BT mail and sign in, the email appears correctly. Similarly mail on my ipad and Iphone shows the correct message so this only seems to be an issue for my desktop. Neither of the original incoming mail senders are in my address book, nor is the incorrectly displayed sender.
Mac mini, macOS 10.13