LinuxQuestions.org - Postfix Appends FQDN to Senders Address

I am using a new Postfix server and when I send an email to anyone, it shows the FQDN as follows:

user@mail.myserver.com

When it should display:

user@myserver.com

Now in my Postfix main.cf file, I made sure to check I have:

Code:

myorigin = $mydomain

Now obviously mydomain = myserver.com in my main.cf. So now I don't know what to do. Users will see this as a huge inconvenience and will start to complain. Could this be Amavisd?

Anyone know what I can do to test who and why this is occurring?