Postfix: Invalid domain

[nukoso]

Hey, i've set up a postfix based mail server on a public IP.
I haven't configured a domain name yet, but i tried to test it, sending an emai to the root@[a.d.d.r] from gmail (and hotmail, but it won't let me use "[]" in the recpt) but seconds after i hit send, i get a delivery failure:

This is an automatically generated Delivery Status Notification

Delivery to the following recipient failed permanently:

    root@[a.b.c.d]

Technical details of permanent failure:
PERM_FAILURE: Parse Error: Illegal To: address (invalid domain name): root@[a.b.c.d]

  ----- Original message -----

Received: by 10.141.107.13 with SMTP id j13mr60235rvm.276.1202744954293;
       Mon, 11 Feb 2008 07:49:14 -0800 (PST)
Received: by 10.140.201.20 with HTTP; Mon, 11 Feb 2008 07:49:14 -0800 (PST)
Message-ID: <8da576380802110749t5abdb794y6058719eae046c7@mail.gmail.com>
Date: Mon, 11 Feb 2008 09:49:14 -0600
From: "=?ISO-8859-1?Q?Emanuel_Pe=F1a?=" <------@gmail.com>
To: root@[a.b.c.d]
Subject: Hola
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

que onda

I did a telnet <ip> 25, and succesfully sent an email by hand. What makes me think it's a gmail's problem, what's your oppinion on that, here's my postconf -n, if you see anything that you can advise on me, let me know. I'm new to the whole server thing... Thanks in advance!

# postconf -n

[root@correo pruebas]# /usr/sbin/postconf -n
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
debug_peer_level = 2
html_directory = no
inet_interfaces = all
local_recipient_maps = proxy:unix:passwd.byname $alias_maps
mail_owner = postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
mydestination = $myhostname, localhost.$mydomain, localhost
mynetworks_style = host
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.4.5/README_FILES
relay_domains = $mydestination
sample_directory = /usr/share/doc/postfix-2.4.5/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
unknown_local_recipient_reject_code = 550

[jledhead]

do your postfix logs show the connection? if so post that here

if not then maybe gmail doesn't like sending to @[ipaddr]

[nukoso]

maillog shows no connection from gmail, i agree with you, it seems that gmail doesn't like raw ip addresses. thank you a lot. i'll try on a different server, to se if i get some good results.