mail host name problem

[jalapela]

Hello

When i receive read mail or view source of mail writes like this

Received: from localhost (localhost [127.0.0.1])
by server.rootdomain.com (Postfix) with ESMTP id 936BD7E039C;
Wed, 9 Mar 2011 08:52:05 +0200 (EET)
can i change hostname server.rootdomain.com to clients domain
(like this for client1.com mail.client1.com)

Thanks for your help

[falko]

No, Postfix uses the hostname that is set in myorigin in /etc/postfix/main.cf.

[jalapela]

Thanks for your help

i wanna ask something,if i change hostname in myorigin (for example xxx.domain.com) is it problem for mail receive and send. (orginal host name is yyy.anotherdomain.com)

[falko]

No, but make sure the new hostname exists in DNS.

[jalapela]

Thanks Falko