Are there any options to re-use routing conditions?
Yes. You have the option to define routing conditions to be re-used in an object called receiver rule. You can then assign the receiver rule to any receiver determination object you want. Note that in case you define a condition within a particular receiver determination, this condition only applies to a message whose address header matches the object key of exactly this receiver determination. If a condition is defined as receiver rule, it applies to all messages whose address header matches the object keys of the different receiver determinations in which the receiver rule is used.
