Dennis wrote on 12/08/2010 10:45:15 AM:

> I've been receiving the following error from one of my lists in the
> Daily error
> monitoring report:
>
> Err First Last  Address
> --- ----- ----- -------
>  3 12/07 12/07 User's Name   <user's email address>
>                 Last error: 5.5.4 501 5.5.4 Unrecognized parameter
>
> There are nine entries in the error report, all from the same
> domain.  I'd just
> chalk it up to a error on the other end, except that one of the e-mail
> addresses is on another list whose messages go through.
>
> I checked the error messages in the LSTOWN archives and came up empty.
Anyone
> seen this error?  Any ideas on how to troubleshoot?

I'd suggest looking at the logs on the mail relay to see if there is more
detail.  Also try sending an email outside of the list to the failing
recipients.  Last, try forging a message to one of the recipients via
telnet from the mail relay.

You might need help from the owner of the mail relay for some of this.



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