Can not send outgoing. Error message is: Your message did not reach some or all of the intended recipients. Subject: test here Sent: 8/24/2016 9:52 PM The following recipient(s) could not be reached: ‘[email protected]’ on 8/24/2016 9:52 PM 550 5.7.1 Spam detected by content scanner. Message rejected.
I spoke with optonline support and they say it is not anything they are doing.
What/where/who is “content scanner” that has rejected my outgoing messages?