Cant't send email from a same network machine

[GuS]

Hi guys,

I being using ISPcp from some time and i always forget to ask (and i think i've fixed this long ago but i cant remember how I did it :S )

The problem is when I try to send email (from a email client, for for example, from sendEmail) from a local network machine (same network of my server) i got this:

Quote:Nov 28 05:53:33 server postfix/smtpd[20329]: connect from unknown[192.168.1.20]
Nov 28 05:53:33 server postfix/smtpd[20329]: NOQUEUE: reject: RCPT from unknown[192.168.1.20]: 450 4.7.1 <anakin>: Helo command rejected: Host not found; from=<info@gdnet.com.ar> to=<gdiaz@gdnet.com.ar> proto=ESMTP helo=<anakin>
Nov 28 05:53:33 server postfix/smtpd[20329]: lost connection after RCPT from unknown[192.168.1.20]
Nov 28 05:53:33 server postfix/smtpd[20329]: disconnect from unknown[192.168.1.20

Using my public domain (gdnet.com.ar) or the private IP of my server does not work.

Example of how I am sending with sendEmail command:

Quote:/usr/bin/sendEmail -s mail.gdnet.com.ar -xu info@gdnet.com.ar -xp MyPasswd -f info@gdnet.com.ar -u SubjectString. -t gdiaz@gdnet.com.ar -m MessageString

Is there something i must modify from Postfix or other conf to avoid this? (I think yes... but i cant remember exactly...).

Thanks in advance.

Cheers.