> More succinctly put, the list server is having trouble reliably reaching
> your machine. Most likely this isn't the list servers problem, it's yours
> due to either sporadic connectivity on your part, or somewhere between the
> list server and you, or sporadic DNS service on your part. If you have any
> issues after looking into this, contact me off-list and I'll try to help.
Most likely, the same thing happens to OP that happens to me: the lists
run at gnu.org are crawling with spam, and a good number of them get
rejected somewhere between gnu.org and OP's final destination. After a
certain number of rejections, $LIST_MEMBER's subscription is disabled
automatically.
