postfix domain change

[David Hláčik]

Hello guys,

i am using postfix as my mailserver on machine running amanda backup server
. Amanda sends mails as user amanda - so mail is from
amanda at backup.net.hlacik.eu (backup.net.hlacik.eu is servers hostname) .
Unfortunatelybackup.net.hlacik.eu is not valid domain name in outside world
and our company rented mailserver complains about non - existent domaind and
delivery is rejected.

How can i tell postfix to replace backup.net.hlacik.eu to cz.hlacik.eu ?

Thanks in advance,

David
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