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Issues with size restrictions exchange2013

I'm having an issue with incoming emails size restrictions in exchange. We are running exchange 2013 what's happening is a sender from outside our network will send an employee a email with attachments over 9mb and we never receive them and the sender doesn't receive a kick back so they think it was delivered. When I run
get-mailbox username | ft max messagesize      it states "unlimited"
get-transportconfig | ft maxreceivesize          it states "40 MB"
get-receiveconnector | ft username, maxmessagesize                it states "35MB"

Am I missing something that maybe set to block over 10mb from external senders?
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William Fulks
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William; I have also tested from my personal gmail account with a 16MB file and it does the same no kick back to sender and it never appears in my inbox, junk or spamfilter

Todd; I have not checked the SMTP logs but I will look into that, There is no mail flow rule on size those are not configured, Our firewall is monitored by a 3rd party and I had them check into before I created this case.

Gaurav; I posted those results in the question and I will post below in my reply to Alan

Alan; They are not sending to a distribution group here are the results in order from your first set of commands. 40MB, 40MB for the externaldnsmaxmessagesize and internaldnsmaxmessagesize it comes back with no output the command runs it just doesn't seem to have a value
Todd, I have enabled logging on all the receive connectors but I can seem to find anything that is coming in externally. I have been sending test emails (with and without attachments) from my gmail account then I did a search for gmail in the log and the only ones it located were gmail addresses that internal users had sent external emails too.. So I'm not getting something right here, I'm in mailflow-receive connectors, is that not the correct location for what I'm looking for?
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Hi bankadmin,

What was the output from those commands I suggested above?

Alan.
Good advice offered to find what is causing the problem.