In my daily report: The following n subscribers are currently being monitored: Err First Last Address --- ----- ----- ------- 1 08/12 08/12 Zazu Friberg <[log in to unmask]> Last error: Mailer mail.podzerone.com said: "553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)" Can anyone explain in layman's terms what is happening here? Thanks, Christine in Littleton, Massachusetts