On Sat, 5 Nov 2005 16:36:56 -0800, Sherry Beauchamp
<[log in to unmask]> wrote:

>"550 Rule 11 imposed mailbox access for xxxxx@xxxxxxxxxxx refused"
>
>Does this mean they're gone, their mailbox is full, or they're 
>blocking our mail?

It's hard to say exactly, but I would interpret this to be similar to what
users in AOL.com (and other providers also) can do, namely, block incoming
mail from a specified list of addresses.  So, if your From: address is not
on the block list, then your mail will be received.  If your From: address
is on the block list, then your mail will be rejected.  The 550 means "no
such user", otherwise known as a permanent bad address error.