One of our round trip sensor is always green. Investigation has shown the sensor is using other (foreign) round trip mails as proof. It seems that PRTG "ignoring" its own checksums of each sensor. But only for this sensor. All other (earlier created) round trip sensor work as should. No mail with checksum in time limit, sensor gets red. (Thats why other round trip sensor had a chance to get red as long as the new one was active.)
Is there any other way "to fix this" other than create for each sensor its own mailbox as mentioned in manual?