I created a distribution list some time ago so it has many email addresses in it now. A couple months ago we added an outside email address. For example our email addresses end with @company.com and the email address entered into the distribution list was vendor@anothercompany.com. When I go to delete him from the distribution list I get this error. Any ideas.

Message: non-existent members: vendor@anothercompany.com in distribution list: dist@company.com Error code: account.NO_SUCH_MEMBER Method: RemoveDistributionListMemberRequest Details:soap:Sender