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I sent an invitation to a new free email address of mine. This is the Invitation message it received:

| Subject: Invitation to join the <groupname>@groups.io email group
Shouldn't this be "<groupname>.groups.io"? (and again in the message body)?


Message body:
| Hello <emailaddress>@outlook.com,
|
| You have been invited by <me> to join the Groups.io group <groupname>@groups.io.
|
| The following message was included by <me>:
|
| <my custom message>
|
| If you have questions about this invitation, send them to <groupname>[email protected].
|
| To accept the invitation, please reply to this email, or you may accept the invitation on the website.
|
| If you are not interested, or if <emailaddress>@outlook.com is not your email address, please ignore this email.
|
| Cheers,
| The Groups.io Team

"accept the invitation" was a clickable link to the <groupname>.groups.io website which make sense,
however at the bottom of the Invitation there were 3 confusing and unexplained 'buttons':
"Thank you for the invite." , "Thank you for the invitation." , and "Can you please add me?"
What are these 3 unexplained 'buttons', what is the difference between them, and where do they go?