Domain Rewrite is failing with error: "The transport rule can't be created because you've exceeded the number of characters available" (4373437)

Domain Rewrite is failing with error: "The transport rule can't be created because you've exceeded the number of characters available"

Domain Rewrite is failing with error:

"The transport rule can't be created because you've exceeded the number of characters available for word- or pattern-matching in all your transport rules. Your transport rules are using 20550 characters, and the maximum number is 20480. Reduce the number of characters, either by removing content, such as words or regular expressions, from the conditions or exceptions, or by removing conditions or exceptions. Or delete existing transport rules that use word- or pattern-matching."