We would need to see the complete error message.
Right-click on it, copy, then paste it into a reply here.
Gary VanderMolen
"Emma" <Emma RemoveThis @discussions.microsoft.com> wrote in message news:4C3E4E9E-7928-45AF-A933-B80B82455B02@microsoft.com...
> When I try to send email using one of my accounts I get a message:
> Authentication 553... What is that and how do I do it?
> Thank you.