SQL DBmail taking ages to send emails

We send around 300 emails out at 4pm every day however there is something i suspect on my exchange server that limits the amount SQL is allowed to send to it within a certain period.

I have set SQL to keep retying until the emails send but thats just a work around.

Is there a setting i can change on my exchange server to allow SQL to send more emails at once? We are using exchange 2016 with sql 2012.

Thanks in advance for any help.
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CaptainGibletsAsked:
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AmitIT ArchitectCommented:
Any error you see?
CaptainGibletsAuthor Commented:
The mail could not be sent to the recipients because of the mail server failure. (Sending Mail using Account 3 (2016-09-21T16:57:11). Exception Message: Cannot send mails to mail server. (Service not available, closing transmission channel. The server response was: 4.4.2 Message submission rate for this client has exceeded the configured limit).
)

however if i run Get-ReceiveConnector | select identity,messageratelimit i get the attached.

My 2 sql connetors depeding on what server i point them to both have "unlimited"

message rate limit
AmitIT ArchitectCommented:
How is CPU usage on Exchange server. Total how many servers you have?
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CaptainGibletsAuthor Commented:
2 exchange servers, there cpu usage is at around 5% on server db mail profile points to.
messageratelimit.png
AmitIT ArchitectCommented:
How about mail flow for normal users? Do you see any delay. I suggest you to create separate relay connector for application mail flow. Then test again.
CaptainGibletsAuthor Commented:
the delay is only for the SQL server.
AmitIT ArchitectCommented:
Create new relay connector and test it. Or you can enable pipe line tracing to troubleshoot this further. How to do it:
https://technet.microsoft.com/en-us/library/bb125018(v=exchg.150).aspx

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AmitIT ArchitectCommented:
Hi CaptainGiblets,

Did you created the relay connector, I suggested? Or issue still persist
AmitIT ArchitectCommented:
Creating relay connector is best option.
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