email encoding
can have decoding issues
there are workarounds
Multipurpose Internet Mail Extensions (MIME) is an Internet standard that extends the format of email to support:
- Text in character sets other than ASCII
- Non-text attachments: audio, video, images, application programs etc.
- Message bodies with multiple parts
- Header information in non-ASCII character sets
Virtually all human-written Internet email and a fairly large proportion of automated email is transmitted via SMTP in MIME format.
https://support.apple.com/guide/mail/add-attachments-mlhlp1050/mac
Make sure you send Windows-friendly attachments. To do so for all messages, from the Message viewer choose Edit > Attachments, then make sure Always Send Windows-Friendly Attachments is selected (it has a checkmark). For a specific message you’re writing, click the Attach button in the toolbar of the message window, then make sure Send Windows-Friendly Attachments is selected (if you don’t see this checkbox, click Options in the bottom corner).
