Postfix and DNS problem

[Kolusion]

- Running Postfix, BIND9

I recently sent off an e-mail and was returned rejection because my hostname "n-desktop" was not a FQDN.
I host multiple domains from my computer, so I don't use a FQDN in my hostname.

I hashed out 'myhostname' in postfix's main configuration file, which resolved the issue of getting the mail through to the destination I needed to contact, however, since doing this people cannot send mail to me.

When someone tries to send me mail, they get something similar to this:

This is the mail system at host n-desktop.localdomain.

bla bla bla

Host or domain name not found. Name service error
for name=n-desktop.localdomain type=A: Host not found

Why is this occurring?

[Kolusion]

Ok, I have returned 'myhostname' back to n-desktop. I can now receive mail.

I guess the system I was sending to hasn't got with the times and been configured to work with virtual hosts.
The server I was sending the mail to is in Vietnam and I was contacting them to report spam originating from its network and asked them to better regulate it, so their 1999 configuration doesn't suprize me.

Does anyone know of a way that will allow Postfix to specify the FQDN for the domain its sending mail for?
If I can do this, then I can work around servers that refuse mail from other servers that normally use their local hostname as their internet hostname.

[ioanna83]

Does anyone know of a way that will allow Postfix to specify the FQDN for the domain its sending mail for?

It depends on how you are sending mail. Usually you can set the From: header to be whatever you want with a script. Or you can configure postfix with virtual domain support and use smtp auth to send mail as that user@domain