Avast for Business blocking sending messages with attachments.

Good afternoon.
I am having a little problem with Avast For Business since last thursday. It is blocking every message we sent by our webmail or outlook that has attachments. We have already configure it to exclude all the addresses our e-mail uses but it does not work.
If we disable it, all messages are sent with no problem. There is any thing we can do more than configure exclusions to scan the email addresses?

Thanks.

Avast For Business / Avast Endpoint Protection >> https://forum.avast.com/index.php?board=77.0