Exchange 2007 problem s prijatim mailu

Ahojte, dufam ze najdem tu niekoho kto robi s exchange a vie podstatne viacej ako ja. Mam problem s prijatim emailu. Do vcera vsetko islo OK, ale dnes to ruplo. Nejdu prijatm maily iba posielat. v EMC cez toolbox a RCA som si dal testnut linku a hadze mi nasledovny log:

Attempting to send a test e-mail message to bajanek@therme.sk using MX etrn.telekom.sk.
Delivery of the test message failed.
Additional Details
The server returned status code 452 - Insufficient system storage. The server response was: try later
Exception details:
Message: Insufficient system storage. The server response was: try later
Type: System.Net.Mail.SmtpException
Stack trace:
at System.Net.Mail.SmtpConnection.GetConnection(ServicePoint servicePoint)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at Microsoft.Exchange.Tools.ExRca.Tests.SmtpMessageTest.PerformTestReally()

uz si neviem rady co mam spravit. Na disku je miesta dostatok, cca 55GB, nieco som cital aj o nastaveni RAM, ale v tom nevidim problem, doteraz to slo OK. Dufam ze sa niekto najde co vie poradit.