Greetings

I analysed some emails in testconnectivity.microsoft.com and get to know that the some of the emails taking 5-10 seconds for delivery.

I have 2 Mailbox servers and 2 CAS on Exchange 2013 CU7.

Almost all of the delay is happening while submitting the email by Mailbox1 to Mailbox2.

Kindly suggest me how to decrease the Email delivery time.

And what factors this Email delivery time depends. 

Thanks in advance

• Edited by K 2 Sunday, July 05, 2015 8:06 PM

Hi,

Does it happen from Mailbox server 2 to 1? It sound like your receive connectors has the tarpit attribute set to default 5sec. check it by going into EMS and type get-receiveconnector "<servername>\default <servername>" | select tarpitinterval. You should see 00:00:05. You can check this to anything you want but it will depending on your requirements and bandwidth. 

• Proposed as answer by Allen_WangJFMicrosoft contingent staff, Moderator Tuesday, July 07, 2015 6:29 AM

I have noticed this latency (approx 5-10 sec) in some of the internal emails irrespective of attachment size.

• Edited by K 2 11 hours 34 minutes ago