The SMTP service in BODS doesn't seem to buffer the messages like a real SMTP server would. If a connection is dropped, it simply loses the message. I got around this by installing an SMTP server (it's part of IIS) on the BODS server itself. Then BODS points to the localhost server which buffers the messages if it is having trouble connecting to the corporate SMTP server.
You might want to talk to your IT security people about this first, in case they have additional requirements, such as using a whitelist to prevent it from being used as a spam relay.