Not delivered some messages to addresses @yandex.ru @rambler.ru

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Hello!

There is an online store which sends 1-2 emails a minute (thanks for ordering, your order is fulfilled, etc.).
Customers with boxes @rambler.ru @yandex.ru (and only with them!) constantly complaining that the letter they never came. Moreover, some comes and some don't. If not reached — mails in the "spam" no.

Server is Debian 5 Lenny, as the STMP server is: exim4.

sudo grep rambler.ru /var/log/exim4/mainlog

It gives a long list of such errors:

2010-12-07 15:22:27 1PPwYq-0002i5-KM SMTP error from remote mail server after DATA: host imx1.rambler.ru [81.19.66.234]: 452 4.7.1 Try again later
2010-12-07 15:22:28 1PPwYp-0002i0-Ah SMTP error from remote mail server after DATA: host imx1.rambler.ru [81.19.66.235]: 452 4.7.1 Try again later
2010-12-07 15:22:28 1PPwYp-0002i0-Ah SMTP error from remote mail server after DATA: host imx2.rambler.ru [81.19.88.3]: 452 4.7.1 Try again later
2010-12-07 15:22:29 1PPwYp-0002i0-Ah SMTP error from remote mail server after DATA: host imx2.rambler.ru [81.19.88.5]: 452 4.7.1 Try again later

and

2010-12-07 15:18:09 1PPwTo-0002KU-Kl == xxxxxxxx@rambler.ru R=dnslookup T=remote_smtp defer (-46): SMTP error from remote mail server after DATA: host imx2.rambler.ru [81.19.88.5]: 452 4.7.1 Try again later

What could be wrong? Rambler banned my IP (why some letters reaching)? Or is it something else?
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7 Answers

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this greylisting — way of dealing with spam, trying to send mail, the server responds again later — at this stage a lot of spam falls off (not making a second attempt to send), and the correct mail servers have to wait and try again. so we need to look at your settings — the server is obliged to re-send a letter after such a response time is 10-15 minutes.
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I think first we need to get in touch with their tech support.
\r
Next is to take care of the verification of the mail server (DKIM, for example)
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I have in the server settings were written to the host localhost.localdomain, because of this mail.ru do not accept messages. But as stood the MTA qmail.
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Previously I used @Rambler ohms, often did not come to confirm your registration and so forth. Switched to gmail. They are there to spam a bit too harsh was.
(mail.ru in turn, on the contrary all passed and I went to the rambler).
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also using exim4 configured DKIM, SPF and PTR delivery problems have not yet been observed.
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This greylisting. Just spammers usually do not repeat your letter if they refuse.
\r
In General you do not touch the queue, slowly autoslide.
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Nothing can be done. As already mentioned, it's greylisting. Rambler.ru in this sense, the most obnoxious.
But you can buy more IP or multiple VPS to rent and taxied mail via the IP or smart host.
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