Hello,

I need help to get sending e-mails out fo my Ubuntu 10.10 box.

My PC is connected via ADSL modem (NAT) with static public IP
adress.
It is standard "Internet client" standalone computer.
I want to use Postix (e.g while logging of sent mails, ..) instead
of using my ISP's SMTP server. So I have installed Postfix.

If I send (from Evolution MUA) test email via Postfix 
from <jiri.pa...@email.cz> to e.g. <jiri.pa...@centrum.cz>, then all
goes OK.
But if I send email to <kenap.i...@gmail.com>, then it FAILS.

In log is:

-------------------------------------
Mar  1 08:28:46 duron650 postfix/qmgr[12923]: 4F758A2F17:
from=<jiri.pa...@email.cz>, size=572, nrcpt=1 (queue active)
Mar  1 08:28:47 duron650 postfix/smtp[13007]: 4F758A2F17:
to=<kenap.i...@gmail.com>,
relay=gmail-smtp-in.l.google.com[74.125.39.27]:25, delay=0.99,
delays=0.41/0.11/0.28/0.2, dsn=5.7.1, status=bounced (host
gmail-smtp-in.l.google.com[74.125.39.27] said: 550-5.7.1
[85.71.234.108] The IP you're using to send mail is not authorized
to 550-5.7.1 send email directly to our servers. Please use the SMTP
relay at your 550-5.7.1 service provider instead. Learn more at     
                    550 5.7.1
http://mail.google.com/support/bin/answer.py?answer=10336
a17si5071366fak.100 (in reply to end of DATA command))
Mar  1 08:28:47 duron650 postfix/cleanup[13003]: 46508A2F18:
message-id=<20110301072847.46508a2...@108.234.broadband4.iol.cz>
Mar  1 08:28:47 duron650 postfix/qmgr[12923]: 46508A2F18: from=<>,
size=3139, nrcpt=1 (queue active)
Mar  1 08:28:47 duron650 postfix/bounce[13014]: 4F758A2F17: sender
non-delivery notification: 46508A2F18
Mar  1 08:28:47 duron650 postfix/qmgr[12923]: 4F758A2F17: removed
Mar  1 08:28:50 duron650 postfix/smtp[13007]: 46508A2F18:
to=<jiri.pa...@email.cz>, relay=mx50.seznam.cz[77.75.77.47]:25,
delay=3, delays=0.08/0.01/2.1/0.82, dsn=2.0.0, status=sent (250
2.0.0 Mail 5201 queued for delivery in session 7c9300000034.)
Mar  1 08:28:50 duron650 postfix/qmgr[12923]: 46508A2F18: removed
-------------------------------

I have spent many time with googling about this. I have found many
questions, but no answers.

So I have try change my "myhostname" in main.cf (and restart
postfix):

myhostname = 108.234.broadband4.iol.cz

This is the correct (from  reverse DNS lookup) name of my "outside"
address.
But this do not help.

So ... what is the problem ?
What kind of test exact does the server of Google mail ?
Haw to satisfy its  requirements ?


I hope someone will help me, thanks

--kapetr

P.S.: sorry please my English

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