Possible modifications:

At the connector level: No modification is possible under the risk of altering the flow of mail in an absolute way.

At the rule level: You change the target of the rule, that is, whom this rule applies to. By default, Letsignit applies this rule to the entire domain.
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On the Azure interface we can see the connectors enter and depart:

​We can see the rule again:

And we see the authentication being allowed:
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#SMTP #Office365 #Mobility