Thank you for your reply and info.
Have learned something this morning!
Appreciating your help!
Sorry , have been no help with unsubscribing, so far.
Wonder if this Apple support article might help
How to cancel a subscription from Apple:
(scroll to "on Mac", if need be.)
https://support.apple.com/en-au/HT202039
Or,
You can click the "Get Support" link to Apple at top right on this discussion page.
Or
If you haven't been able to unsubscribe:
Another option:
Go to Mail/Preferences/Rules and create a rule to delete the e-mails or move them to the Trash.
All the best :-)