Проблем с sendmail

Sendmail 8.9.3 на redhat 6.1 с ядром 2.2.16. От нас письма уходят нормально. До нас не доходят. В ответ получаем: The original message was received at Mon, 7 Aug 2000 18:44:41 +0400 from mx8.mail.ru [194.67.23.80] ----- The following addresses had permanent fatal errors ----- <muser1@rosmark.ru> <muser2@rosmark.ru> ----- Transcript of session follows ----- 550 <muser1@rosmark.ru>,<muser2@rosmark.ru>... Host unknown (Name server: rosmark.ru: no data known) ---------------------------------------------------------------------- Reporting-MTA: dns; mail.rosmark.ru Received-From-MTA: DNS; mx8.mail.ru Arrival-Date: Mon, 7 Aug 2000 18:44:41 +0400 Final-Recipient: RFC822; muser1@rosmark.ru Action: failed Status: 5.1.2 Remote-MTA: DNS; rosmark.ru Last-Attempt-Date: Mon, 7 Aug 2000 18:44:42 +0400 Final-Recipient: RFC822; muser2@rosmark.ru Action: failed Status: 5.1.2 Remote-MTA: DNS; rosmark.ru Last-Attempt-Date: Mon, 7 Aug 2000 18:44:42 +0400 У провайдера в DNS для rosmark.ru прописана запись MX mail.rosmark.ru.