550 Rate Limit Error

[Guest SGriffin.Esp]

Our business keeps getting the following error when sending batch emails to our staff;

 

 

SMTP1 #550 RATE LIMIT: Too many messages sent in the last 1h

 

 

Certain messages still go through and I can't find a trend. Our ISP (TalkTalk) has said it is not an issue at their end but a Microsoft SMTP issue.

 

We use a catchall (POP3 email) and distribute to our network via Microsoft Exchange Server 2010 which is running on Microsoft Small Business Server 2011.

 

 

I have check this morning and neither our IP or company domain are blacklisted.

 

 

Any help/advice would be much appreciated.

 

 

Thanks

 

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