I think there is a bug in the way some internet connection (red interfaces) are reported by email : obviously some the connexion states fore some interfaces are reversed :
The connexion looks like down all the time, which is fortunately not the case
Interestingly, the backup connexion’s status is correctly reported.
The network interface is an Intel Corporation 82546GB Gigabit Ethernet Controller (4 in one).
I don’t use multiwan so forgive my ignorance, just trying to understand the problem.
The dates within the email body are correct for the down/up state, but they are delivered/received with such delay that they pile up in the mail inbox in the wrong order?
Through which interface is every mail send (some clues in the mail headers)?
Edit: and /var/log/maillog might be worth looking at.
You nailed it @dnutan ! The messages are sent in the right order. But for one or another reason, they are received in the reverse order by the distant MTA (this server is not used as a mail server).