I'm having a problem with postfix. I have a mailserver which is called strangely enough mailserver. So mailserver.xxxx.com I have two local users created on this server test1 & test 2 I try to send a message for example from test1 to email@example.com and I get a message saying that the user is unknown in the virtual alias table. However if i send a mail to firstname.lastname@example.org its all fine. Does anyone have any clue at all as to why it is doing this? The virtual file in /etc/postfix/virtual has the following settings xxxx.com email@example.com test1 firstname.lastname@example.org test2 I'm sure it must be something fairly obvious that's wrong. All virtual machines are running on their own network, all set up without a DNS server in the network. Postfix is running on a rhel 5 server.