I think emails from Email 2 and Email 3 used to be included in the people pane of a contact but now it seems only Emails from the primary email is shown.

The people pane shows the email address of which mails are being displayed. I have to delete that email address to show mails from the next email address.

Is there a way to show them all combined together?

For contacts which are just companies I bought something from, it would be better if I could see all emails from their domain without having to specify each one, as most companies will send email from multiple addresses for example;

sales@
support@
noreply@
service@
editor@
ts.case.reply@

and so on.

Is there a wild card I could use in an email address like *@domain.com to catch all emails?

Even better would be an toggle option connected to the field "Web page address" which does that.