I am receiving messages into SpamHero, and they are showing in the Quarantine+. But, they are failing to send to my mail server. I am seeing this error when I look at the delivery logs:
status=bounced (host example-com-au.mail.protection.outlook.com[104.47.117.36] said: 554 5.4.14 Hop count exceeded - possible mail loop ATTR34 [SY3AUS99FT999.eop-AUS01.prod.protection.outlook.com] (in reply to end of DATA command))
To solve this problem, you must ensure your mail server is configured to accept these messages. It may be a user specific setting.