The public should only see the mail router. The MS mail server should have an allow relay entry for the connector used by the i. Should not cause a problem.
In one case, the mail is being relayed through the SMTP server and then
the POP server on the i. If I read the responses correctly, then proper
SPF implementation would allow for this. I have another similar customer,
however, who uses an in-house MS mail server as their Mail Router in the i
SMTP attributes. Do you think this situation could create issues?