Hello all, This is a weird problem I am having. Software used: Qmail, Qmail-Scanner, courierIMAP O/S = Fedora 5 Virtual Domains I can send email from my own network from my email client just fine. But when I try setup the email client from outsite my network, I get this: [ERROR] The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'email@xxxxxxxxxxx'. Subject 'Test', Account: 'BW(Lists)', Server: 'mail.example.com', Protocol: SMTP, Server Response: '451 Dynamic IP Addresses See: http://www.sorbs.net/lookup.shtml?xxx.xxx.xxx.xxx', Port: 25, Secure(SSL): No, Server Error: 451, Error Number: 0x800CCC79 [/ERROR] Also, when I use SquirrelMail it also works out of my network. Now, I have static IP on my mail server, so this weird. Hopefully I explained this right. If anyone has any questions please let me know. Thanks, Will W.