Migrating Exchagne 2007 to 2013

Hello Experts,

We are in the process of migrating users from Exchange 2007 to 2013 in our environment.  We have only moved a select few test users at this time to get all of the problems worked out.  Recently we've noticed that users on the new Exchange 2013 server have problems sending excel documents to our users still on the Exchange 2007 server.  Below are the type of error messages we are receiving.  From the 2013 server we can send those same messages to outside email addresses.

Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept email from certain senders, or another restriction may be preventing delivery.
Remote Server returned '550 5.7.1 Requested action not taken: message refused'

Does anyone have any ideas?

Thanks
MMICAsked:
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
I don't think this is a size issue. It is more likely third party interference. Anything between the servers? Antispam or AV tools?

Simon.
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Simon Butler (Sembee)ConsultantCommented:
The error means what it says - the message was refused. Therefore the problem is probably with the Exchange 2007 server. I presume that users can send between themselves on the Exchange 2013 server?

The fact that they can send the other way is actually completely immaterial to the problem. With Exchange 2007 and higher, sending and receiving are separate things, so it is perfectly possible to work one way and not the other.

Simon.
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MMICAuthor Commented:
To add to this question excel documents under about 20k go through to our users with no problems.  Over that size and we get a bounce back.
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MMICAuthor Commented:
Simon, Yes the users can send between themselves on the Exchange 2013 serer.  I know it is possible for them to work one way and not the other as well as this is obviously happening.  I would like to know what setting it could be to make it work both ways.
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MMICAuthor Commented:
you were right.  this all had to do with symantic antivirus on the old exchange server.
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