You may be confused about the relationship between the Nabble archive of this mail list and the list itself. I am confused by you mentioning an SMTP error. An SMTP server is used to send mail, but your question appears to be about receiving mail via a subscription to the list archives maintained by Nabble.
I also note that your posts via the Nabble archive of the mail list are marked as not being accepted yet. That suggests that you have not yet been accepted on to the mail list itself. Have you done all that is necessary to subscribe to the list. (This is not the same as subscribing to the Nabble archive.) Are you using the same address to subscribe to the Nabble archive as you are to the list?
For more help see:
http://restlet-discuss.1400322.n2.nabble.com/mailing_list/MailingListOptions.jtp?forum=1400322If there is a problem with your subscription to the list then you must take that up with the list owners.
Volunteer Helper - but recommending that users move off the platform!
Once the admin for GregHelp now deleted.