Here's the problem. I have user accounts who use another ISP. When they pickup their mail from my e-smith server using a pop3 email client, everything is fine, untill they try to send out mail. They get an error message if the user is not an existing account on my server.
Error message: The message could not be sent because one of the recipeints was rejected by the server. Server Responce: 533 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1) (Account: user.name, SMTP Server: 'mail.mydomain.com', Error Number: 0x800ccc79). (real names and domain changed to protect them here)
Is there a way to fix this so that selected clients can send out their mail?