Today’s email clients can be very strict about what to do with emails from an “unknown sender”, which is what I am if you are new to my site. Some just accept them into your In-Box; others will send them to spam/junk; the strictest will just delete them unread.
Have you checked your email’s spam/junk mailbox?
It may help to add my name and email address to your contacts: system-sent emails from rehearsalfiles (at) johnfletchermusic.org, with a Reply-To my personal address: john_fletcher (at) mac.com
Check with the Group Owner that they definitely have your correct email address.