Нужна помощь в настройке связки isp-панель+sendmail+dovecot+greylisting

Нужен мастер для грамотной настройки почты. Freebsd, ISP панель

Есть некоторые проблемы с почтой. Часть почты не доходит, также имеют место ошибки при отправлении. Тут еще как я понимаю проблема с DNS.

Например:

----- The following addresses had permanent fatal errors ----- <'xxx@xxx.ru'>

(reason: 550 Host unknown)

----- Transcript of session follows ----- 550 5.1.2 <'xxxxx@xxxxx.ru'>... Host unknown (Name server: XXXXX.ru': host not found)

и

The original message was received at Thu, 2 Jun 2011 15:30:00 +0400 (MSD)

from [31.7.226.119]

----- The following addresses had permanent fatal errors -----

<XXXXX@domyes.ru>

(reason: 501 <customer-XXXX.eserver-ru.com> is invalid or DNS says does not exist)

----- Transcript of session follows -----

... while talking to mail.domyes.ru.:

>>> >>> MAIL From:<XXXXX@XXXX.ru> SIZE=4206

<<< 501 <customer-XXXX.eserver-ru.com> is invalid or DNS says does not exist

501 5.6.0 Data format error

Reporting-MTA: dns; customer-XXXX.eserver-ru.com

Received-From-MTA: DNS; [31.7.226.119]

Arrival-Date: Thu, 2 Jun 2011 15:30:00 +0400 (MSD)

Final-Recipient: RFC822; XXXXX@domyes.ru

Action: failed

Status: 5.5.2

Diagnostic-Code: SMTP; 501 <customer-XXXX.eserver-ru.com> is invalid or DNS says does not exist

Last-Attempt-Date: Thu, 2 Jun 2011 15:30:39 +0400 (MSD)