1745-members@toastmastersclubs.org does not work.

Now that is certainly interesting. Adam Biel sending as Admin can in fact, send to members. In order to be Admin doesn't he have to log into the website as Admin and send the schedule or messages from the website? If so, it isn't the same as my being on my home PC and trying to send to the server which then sends the messages. If so, TWC still has a point that the problem may still be on the toastmastersclubs.org server side. May I request a bit more help to refute TWC and get the problem elevated to a higher technical support level. Could you on your home PC using a home client mail program such as Windows Live Mail send a test message to "members-1745@toastmastersclubs.org"? If your message goes thru then I can give solid proof to Time-Warner that the problem is at their end. Thank you in advance for your patience.

Who you are logged in as has nothing to do with being able to send emails to the list. What matters is that you are defined as a club member and you are using the address in your profile. It's possible to have an admin who is not a club member, and who won't be able to send to the list.

You need to be logged in to send out agendas and use the Basic Email function, but not for emails to the mailing lists.

If any of the ambassadors send to the list from their home PC, they won't be able to use the mailing lists. Unless of course they make themselves members first.

We can send to the public email addresses, such as admin-nnnn@... president-nnnn@ (when nnnn stands for your club number). I'm happy to do that but I'm not sure if that will help you.

Yes, you are correct. I forgot about that rule. This is going to get easier as I have a club meeting in the morning. I can get one of the officers to try to send to members-1745 and see what happens. I just also wanted to let everyone know that now the officer list mailing has stopped working - officers-1745@toastmastersclubs.org. and it had been working. Here is the error that I am now getting, same as the one before.

"The message could not be sent. The authentication setting might not be correct for your outgoing e-mail [SMTP] server. For help solving this problem, go to Help, search for "Troubleshoot Windows Mail", and read the "I'm having problems sending e-mail" section. If you need help determining the proper server settings, please contact your e-mail service provider.

The rejected e-mail address was 'officers-1745@toastmastersclubs.org '. Subject 'Need Technical Help with members-1745@toastmastersclubs.org ', Account: 'pop-server.insight.rr.com', Server: 'smtp-server.insight.rr.com', Protocol: SMTP, Server Response: '501 5.5.2 RCPT TO syntax error', Port: 25, Secure(SSL): No, Server Error: 501, Error Number: 0x800CCC79"

Let's see what tomorrow brings.

I've found something that might be useful.

Make sure that you're not accidentally including the characters < and > in the email address.

Source: answers.microsoft.com/en-us/windows/foru...95-a6c1-433c00d67596

It sounds very similar to what you're experiencing.

Fixed the problem. After considerable time with TWC techs which could not fix the problem I decided to try to expand on Jane's observation on the actual address itself. I deleted any contact entries with 1745 in it. Then I turned off autofill and resent to members-1745 and it worked. Turned back on the autofill, typed the members-1745 into the address box and deleted all 1745 autofill entries.
Then sent my test messages. Now it works!! Not sure why.

Thanks SO MUCH Jane!!!!! Could not have done it without you!!!