On Sep 27, 2006, at 9:38 AM — 9/27/06, Ingrid Walker wrote:

> Wondered if anyone could help with a query I have.
>
> Over the last few days subscribers using the physics.org domain  
> have been automatically deleted from all of my lists. I have  
> checked my subscribers lists and there is no one left with a  
> physics.org address (there were about 20 on each list). Below is a  
> sample from one of the daily monitoring reports I received:
>
> 1 09/26 09/26 [log in to unmask]
>                 Last error: 5.2.0 550 5.2.0 Your domain does not  
> have any MX
>                             records.
>
> All of the deleted addresses report the same error. I have  
> contacted the Email Administrator who says there are no problems  
> with the domain.
>
> Has anyone come across a similar problem before?

There is an MX record for physics.org. What you should probably do is  
contact whomever is responsible for the DNS server that your LISTSERV  
server uses.