I've had a problem sending emails to certain domains which I haven't quite solved yet. I thought it was a domain issue but that worked out. I got this message back today: There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. <"myserver.local" #5.5.0 smtp;553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)> Why wouldn't some mail not be authorized...I'm not on any blocking lists that I could find. Any Ideas? Any help is appreciated... Thanks, Dan