We received this morning an email from Apple – betaprogram@insideapple.apple.com – which we thought was most odd, so after a few checks online and finding very little information online, I clicked the link with a locked browser and yes it seems the email from betaprogram@insideapple.apple.com was from Apple
and indeed safe.
Looks like we have been invited (sign-up) to try the new iOS 14, iPadOS 14, macOS Big Sur, tvOS 14 and watchOS 7 public release
The hyperlink to the sign -up was https://c.apple.com/r?v=2&la=en&lc=gbr&a=E3Am (the rest is removed) so if you ever receive an email link like this, – https://c.apple.com – then you are in luck
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From Apple:
Apple Beta Software Program
Help make the next releases of iOS, iPadOS, macOS, tvOS and watchOS our best yet. As a member of the Apple Beta Software Program, you can take part in shaping Apple software by test-driving pre-release versions and letting us know what you think.

Note: Email spoofing does occur, so always remain cautious