I have a Cisco 1841 providing internet access with FW and NAT.
The customer has an Exchange server on the internal network. When they send emails with attachments over 15Mbs in size they fail. Emails with attachments under this size are fine.
They have also removed the C1841 and replaced it with a non-cisco firewall and emails were fine.
Does anyone know what on the IOS FW would cause this? Would one of the inspection rules be causing the problem?
Any advice/help would be appreciated.