This type of problem usually requires Site Administrator participation.
Most of the factors involved are outside the scope of list owner settings.

> On Thursday, 21 July 2022 at 10:29:38 am GMT-7, William Schults
> <[log in to unmask]> wrote:
>
> I'm a list owner of a list hosted at listserv.dartmouth.edu
> <http://listserv.dartmouth.edu>.
>
> Last night, all of our yahoo.com <http://yahoo.com> and aol.com
> <http://aol.com> subscribers were deleted after several days of errors.
>
> The errors messages were:
> For Yahoo subscribers:
> Last error was: 5.4.300 550 5.4.300 Message expired -> 451 [RL01] Message
>                    temporarily deferred
> or for AOL subscribers:
>    Last error was: 5.4.300 550 5.4.300 Message expired -> 421 4.4.2 Connection
>                    dropped due to SocketError
> I have manually added the subscribers back in, but expect that errors
> will begin again.
>
> Anyone else experiencing this or have suggestions?  Has there been a
> policy change with Yahoo and AOL that is no longer compatible with
> ListServ?
>
> Thanks in advance.
>
> Bill Schults
> Co-owner [log in to unmask]

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