Non Delivery Reports from Office 365(Mail Bounce Back with no - Microsoft Community

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hi,

i receiving following bounce message office 365

host ***-com-au.mail.protection.outlook.com[65.55.88.170] said: 554 5.6.0 invalid message content [syxpr01mb1774.ausprd01.prod.outlook.com] [sy3pr01ca0087.ausprd01.prod.outlook.com] [sy3aus01ft013.eop-aus01.prod.protection.outlook.com] (in reply end of data command)

we use trend hosted email security our first contact , trend logs messages receive , logs shows following 

but when mailflow->trace office 365 not show logs related message.

i advised turn off defer message if rule processing doesn't complete transport rules.

i have done , added sender safe sender lists still emails getting bounced.

this email not contain attachments.

thanks

this issue no longer happening us.

trend hosted email security/office 365 fixed it.

not sure was. 



Office / Office 365 for admins / Exchange Online / Office 365 for business



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