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.
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:
#SMTP #Office365 #Mobility