Exchange 2010 - Some emails are delayed

Greetings - I have an Exchange 2010 and a user reported that she sent out an email on 9/1/2016 and it was delayed for a few hours until receipting received it.

I am trying to see how I would troubleshoot.

I pulled a message tracking log, however not sure how to read it. I also pulled up Queue Viewer and I do see this below. Not sure how to read this and but I do see 421 Error: Too many messages...

Message Que
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Jaime CamposAsked:
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Carol ChisholmCommented:
Looks like you are trying to relay off a server (Email2relay) which has a limit - either per hours, per day or something else. They are telling you that you are sending more messages than allowed.
Jaime CamposAuthor Commented:
Thank you! How would I read an Exchange ExBPA.data (XML) report.
Carol ChisholmCommented:
I thought it just displayed at the end of the process.
http://www.computerperformance.co.uk/exchange2010/exchange_2010_exbpa.htm

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