Several messages delayed in outbound queue (Full Version)

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Radu.cruceana -> Several messages delayed in outbound queue (27.Nov.2007 7:32:57 AM)

Hi all,
I'm new tot this forum and I have a very urgent problem (like always my job depends on it :) )

We have 1 Exchange 2007 Standard Server (rollup 5) installed on an W2K3 Standard R2 (which is also one of the two DC's with global catalog server on it)  with all roles except edge.
The topology does not imply an edge server, (it goes out directly by an ISA server) 
PROBLEM: Around 10% of the messages are kept several hours in the submission queue with DnsConntectorDelivery delivery type. All others messages (internal or external) goes just fine.  
 
The remote MX server are perfecttly visible with nslookup (set q=mx) from that machine using the same ns server, and if I use telnet <remote ip> 25 everything seems OK.
 
1. I've changed the send conector configuration several times.
2. Internal mail is perfectly OK.
3. There is no pattern for the remote domains on which the queue is blocking (even yahoo.com sometimes).
4. After a time, 3 or 4 hours, those messages are delivered.
 
I really do not know what to do next, except downgrade to 2k3.
Here is output for get-sendconnector:

AddressSpaces                : {smtp:*;1}
AuthenticationCredential     :
Comment                      :
ConnectedDomains             : {}
ConnectionInactivityTimeOut  : 00:10:00
DNSRoutingEnabled            : True
DomainSecureEnabled          : True
Enabled                      : True
ForceHELO                    : False
Fqdn                         : otpleasing.ro
HomeMTA                      : OTPLEASING.LOCAL/Configuration/Deleted Objects/Microsoft MTA
                            DEL:12389e1f-04e0-4c12-9acf-31dbd516384c
HomeMtaServerId              : OTPLEASING.LOCAL/Configuration/Deleted Objects/Microsoft MTA
                            DEL:12389e1f-04e0-4c12-9acf-31dbd516384c
Identity                     : Send Connector
IgnoreSTARTTLS               : False
IsScopedConnector            : False
IsSmtpConnector              : True
LinkedReceiveConnector       :
MaxMessageSize               : 20MB
Name                         : Send Connector
Port                         : 25
ProtocolLoggingLevel         : Verbose
RequireTLS                   : False
SmartHostAuthMechanism       : None
SmartHosts                   : {}
SmartHostsString             :
SourceIPAddress              : 0.0.0.0
SourceRoutingGroup           : Exchange Routing Group (DWBGZMFD01QNBJR)
SourceTransportServers       : {C10}
UseExternalDNSServersEnabled : True
 
and the output for one of those queues:
 
Identity         : c10\125
DeliveryType     : DnsConnectorDelivery
NextHopDomain    : totalsoft.ro
NextHopConnector : 0872ac6a-0b58-41df-9719-9d0e1b73a934
Status           : Active
MessageCount     : 1
LastError        :
LastRetryTime    : 11/27/2007 10:09:06 AM
NextRetryTime    :
IsValid          : True
ObjectState      : Unchanged
Other mentions: I had F-secure install on that server but was uninstalled.
Many thanks and any help will be highly appreciated
 
Radu Cruceana




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