Hi, I'm troubleshooting some mailflow issues on a single Ex2013 server that performs all roles, with 2 mdb.
I'm getting periodic mailflow delays of anywhere from 5 to 30 minutes no more than 2 times a day.
Two items of interest - one, the EdgeSync service seems to fail periodically/occasionally and stays offline. Not sure if this interrupts the mailflow when the service fails or not. Mail is flowing and clients connect fine now and service is offline. I do not have active EdgeSync subscriptions.
Two, when mailflow is interrupted, my upstream spam filter service reports delivery delay with - "The last reason for failure: message text rejected by mail."
I have seen a few threads on this "message text rejected" but not a ton of info. I don't see a ton of useful info in the Event logs or the SMTP connect logs.
Any ideas?