Clues to send mail on LAN through Postfix?

[Wolfgang S. Rupprecht]

Vinicius <cviniciusm at uol.com.br> writes:
>>> root... Connecting to [127.0.0.1] via relay...
>>> 220 myhost ESMTP Postfix (2.3.3)
>>>
>>>  >>> EHLO myhost.mydomain
>>>
>>> 250-myhost
....

You weren't really expecting postfix to find a host called
myhost.mydomain in dns were you?

    $ host myhost.mydomain
    Host myhost.mydomain not found: 3(NXDOMAIN)

In general you need to have a legit hostname set, or at least a
complete and consistent set of lies that get presented to postfix (eg,
via a doctored up /etc/hosts with a few phony entries for your forged
hostname.)

-wolfgang
-- 
Wolfgang S. Rupprecht                http://www.wsrcc.com/wolfgang/