Hi,

 

We have come across a puzzler with Exchange Online. Currently, anyone who
uses a smarthost through our servers must use a valid username and password.
With Exchange Online this is a problem because you cannot set authentication
details!

 

I essentially want to put ASSP in front of Exchange Online just like an
online premises server.

 

I want to do the following:

 

Accept all email from Exchange Online IP addresses sent to locally hosted
domains (default configuration)

Relay all email from Exchange Online IP addresses where the sender domain is
a local domain (or even better, matches a specified list))

Not relay email from Exchange Online IP addresses where the sender domain is
not one of our domains and the recipient is not one of our domains.

 

The third one is the difficult bit as straight forward whitelists would
allow anyone with an Exchange Online account to set up a relay using our
servers, locking it down by sender domain would block any none-hosted
senders from emailing us.

 

Is there an easy setting that can achieve this?

 

All the best,

Colin Waring.

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