Unable to get external email to treasurer@club

Don't know, because I don't get them. There is no bounce message presented to the account.
Presumably it comes from one of their servers.

Pam wrote:

Please try sending from your regular email to another officer, and get them to send to your officer address
There might be an issue with your alternate address.  If the test above is successful, we'll be able to confirm and investigate further

I can send from my regular email to my own office (treasurer@merrimack-toastmasters.org) not a problem.   And I receive club email initiated by other officers all the time.
It seems that officer aliases are not publically receivable.... is that intentional (ie fix the help) or a mistake?
I have about 12 email addrs I can try. Any particular provider?  Hover, Comcast, A2Hosting

I can see emails from the server to your dave@mitton.com  email being sent and received by your email service.

your milton email address uses outlook as its email processor. try another email addrress to send to treasurer@
 

Have you added the paypal email address to your clubs whitelist?

Good question, the problem is I don't know what address those are sent from, since I don't haven't received one.
Looking at my personal PayPal activity, it seems they would come from service@paypal.com so I just put that in our Whitelist

Outlook is my IMAP client on my PC. The mail server for dave@mitton.com is mail.hover.com
The bounced messages above were from dave@circularnetworks.com which is hosted on A2hosting.com
I used my PC's Outlook client to send those messages via the SMTP on my hosted domain on their servers. I'm sure I'd get the same response if I use their webmail page.
I've also put that address in the whitelist and see if I can generate some different messages.

This is the mail system at host relay.mailchannels.net.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<treasurer@merrimack-toastmasters.org>: host
mail.merrimack-toastmasters.org[50.19.253.65] refused to talk to me: 421
Downstream server error
Reporting-MTA: dns; relay.mailchannels.net
X-Postfix-Queue-ID: D2B1F802B04
X-Postfix-Sender: rfc822; dmitton@circularnetworks.com
Arrival-Date: Thu, 18 Apr 2024 13:48:48 +0000 (UTC)

Final-Recipient: rfc822; treasurer@merrimack-toastmasters.org
Original-Recipient: rfc822;treasurer@merrimack-toastmasters.org
Action: failed
Status: 4.0.0
Remote-MTA: dns; mail.merrimack-toastmasters.org
Diagnostic-Code: smtp; 421 Downstream server error
Subject Test
From Dave Mitton <dmitton@circularnetworks.com>
To treasurer@merrimack-toastmasters.org
Date Today 09:48
Testing sending from non-member