When I had similar issues between the core Exchange servers in Houston and a
remote one in Italy, that the queues in the MTAs would bunch up behind a
large message. After extensive Exchange troubleshooting (in vain) it
turned out we had a "dirty" WAN circuit - when that was replaced mail flow
returned to normal. Strange thing was that it appeared fine, Terminal
services to the remote box didn't bomb and pings were fine [1], although it
transpired that the circuit was dropping a hell of a lot of packets.
Concentrate on troubleshooting the network, I'd be surprised if it's an
Exchange issue....
[1] Crude I know.
<>
Event ID 57: Source: MSExchangeMTA Type: Warning Category: X.400 Service
The limit on the number of associations allowed to and from entity
(X.400 address) has been reached. The limit is 9. [MTA XFER-IN 19
34](12)
Event ID 289: Source: MSExchangeMTA Type: Warning Category: X.400 Service
A connection to (X.400 address) could not be opened [MTA XFER-IN 19
26](12)
Event ID 1290: Source: MSExchagneMTA Type: Warning Category: X.400
Service
A locally initiated association to (X.400 address) was refused. The
failure reason provider was 0
and the reason was 0. Control block index 6. Type 1. [PLATFORM
KERNEL 25 130](12)
Event ID 9202: Source: MSExchangeMTA Type: Warning Category: Operating
System
A sockets error 10061 on an accept[] call was detected. The MTA will
attempt to recover the sockets connection. Control block index: /.
[BASE IL TCP/IP DRVR 8 256](12)
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