exchange 2010 too many concurrent deliveries of this message at this time,400 4.4.7

hi all

someone in our org sent an email to a distribution list with quite a lot of recipients in it. Some were received straight away and the rest were received around 24 hours after the original was sent.

in the tracking logs it says "too many concurrent deliveries of this message at this time,400 4.4.7 "

Just wondering is this a configurable limit or more  performance related as in exchange wasn't able handle sending one email to  that many address's at the time
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Daryl GawnSystem AdministratorAsked:
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Brian McDonaldIT ManagerCommented:
You should be able to turn on message throttling

https://technet.microsoft.com/en-us/library/bb232205(v=exchg.141).aspx

Throttle concurrent connections based on messaging database health
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timgreen7077Exchange EngineerCommented:
How many recipients was in the email, also how are your exchange server resources and how large was the email?
exchange can handle sending emails to a lot of users at once.
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timgreen7077Exchange EngineerCommented:
also are all the recipients internal user or a mixture of internal and external?
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Daryl GawnSystem AdministratorAuthor Commented:
email was 3MB, 392 internal recipients no external. Think the other admin was running some content reindexing at the same time the email was sent so suspect that has something to do with it
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timgreen7077Exchange EngineerCommented:
running content indexing can take a toll on the server resources and affect DB performance so that could have been the cause. exchange can easily handle that amount of recipients.
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Daryl GawnSystem AdministratorAuthor Commented:
thanks for the information just wanted clairity
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