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Date: Tue, 14 Aug 2007 16:28:44 +0700 (ICT)
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From: Olivier Nicole <on@cs.ait.ac.th>
To: ngharibyan@mail.ru
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Cc: questions@freebsd.org, freebsd-questions@freebsd.org
Subject: Re: My mail could not be delivered HELP
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> I could not send any mail to that mail server
> 
> Freebsd.org
> 
> But I could deliver mails to all other mail servers?
> 
>  Tue 2007-08-14 13:41:32: <-- 450 4.7.1 Client host rejected: cannot find
> your hostname, [91.103.27.98]  Tue 2007-08-14 13:41:32: --> RCPT
> To:<questions@freebsd.org>  Tue 2007-08-14 13:41:33: <-- 450 4.7.1 Client
> host rejected: cannot find your hostname, [91.103.27.98]  Tue 2007-08-14

The important part of the error message is the one above.

Many mail server only accept messages from machines that have a valid
rDNS reccord.

It looks like you are sending email from a machine with a dynamic IP,
that has no rDNS, so FreeBSD mailing listr server will not accept your
message.

Maybe you should try to send your email through your ISP mail gateway.

Best regards,

Olivier