Postfix & Hostname problems.

[Stewart Williams]

Hi Everyone,

Happy New Year!

I am new to Postfix and I have read various documentation on configuring 
it, but I am having a problem understanding/get to work properly the 
$myhostname setting.

Basically heres what I am trying to acheive...

I have a domain name hosted with a company with an MX record pointing to 
my dedicated FC2 Linux server, that is hosted with another company (I do 
not want to change this). My dedicated server already has a FQDN 
hostname that was assigned by the hosting company. However, I want 
Postfix to use my domain name instead of the system name. So, as far as 
I understood all I had to do to overide this is edit main.cf and put in 
myhostname=mail.mydomain.com. But this causes all sorts of problems; for 
some reason Postfix still insists on using the system hostname. If I run 
'postconf -n' mydomain is listed, so why don't it work? am I assuming it 
can be overridden when a FQDN hostname already exists, but it cannot? 
Arrrggggggggghhhhhhhhhhhh! :)

I've spent hours on this, but can't get no further. Please help.

p.s. if I am being a bit vague or you want details of what goes wrong, I 
will supply them; just didn't want to bore you all to death :)