The spam was running in proxy mode but switch to transparent mode queuing problems presented with emails with attachments and data channel is saturated.
To rule out problems antispam appliance was removed it and mail was routed from the Edge Firewall to HUB Exchange server, and likewise there were problems with receiving emails and data binding remained saturated finally the configuration back placing the Appliance in Proxy mode so that the receiving of e remedied and the bond was released.
Depending on which indicated considerations / reviewing configurations RECOMMEND level Default Receive Connector or the transport layer of the Exchange Organization to receive directly from the WAN on an Exchange 2010 HUB server, considering that the diagnosis is that they are generating timeout in receiving emails with attachments so it is necessary that the sending server need to restart transmission.
To rule out problems antispam appliance was removed it and mail was routed from the Edge Firewall to HUB Exchange server, and likewise there were problems with receiving emails and data binding remained saturated finally the configuration back placing the Appliance in Proxy mode so that the receiving of e remedied and the bond was released.
Depending on which indicated considerations / reviewing configurations RECOMMEND level Default Receive Connector or the transport layer of the Exchange Organization to receive directly from the WAN on an Exchange 2010 HUB server, considering that the diagnosis is that they are generating timeout in receiving emails with attachments so it is necessary that the sending server need to restart transmission.