Exchange 2010 + Delayed incoming mail (hours)

06/11/2014 admin Exchange, News

Once our recipients complained to me about delays in receiving mail from web-service.

I checked the logs for smtp-receiver and found e.g.: Tarpit for ‘0.00:00:00.312’ due to ‘DelayedAck’,Delivered 

In my case I have Exchange behind SPAM-Filter ,so I clean delays for all my receive-connectors with the command:

get-ReceiveConnector | Set-receiveconnector -tarpitinterval 00:00:00
get-ReceiveConnector | Set-receiveconnector -maxacknowledgementdelay 0

Check it:

get-ReceiveConnector | select name,tarpitinterval, maxacknowledgementdelay

Name                                    TarpitInterval                          MaxAcknowledgementDelay
—-                                    ————–                          ———————–
Client                       00:00:00                                00:00:00
Default                      00:00:00                                00:00:00

These delays happen when a remote mail server is configured improperly and use local names for it.

It looks like a spammer for a receiving server and it has the default settings: TarpitInterval = 5min, MaxAcknowledgementDelay = 30min

If there are a lot of e-mails the delay will increase.

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