Members not receiving emails

Our club (PMI Chicagoland) is having difficulties with our list host (members-2072645@toastmastersclub.org) - this is the email address that's generated from the website. We didn't create it.

Multiple members have reported that they are not receiving the emails sent to that address. We have confirmed that these members have enabled receiving emails, and they've checked their spam, promotions, junk, etc. folders. Others of us are receiving them.

Could you advise?

members-2072645@toastmastersclub.org

Is incorrect

Should be

members-2072645@toastmastersclubs.org

How are those different? They look identical to me...

Missing the s after club.

Got it!
Couple of quick follow-ups then...

Do you know why it used to work fine and now isn't?
Do you know why some people are getting the emails and others aren't?
Do you know how to update it? It's the email that was auto-generated when the site was created (before my time)

Thanks for your help!!

Without the s it would never work.
What people did and what people didn't.
What was the subject name?
Update it? What email was auto generated?