Exchange Transport Rule - Warning displayed when Outside organization - Microsoft Community

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hi

i have transport rule set display caution warning when email received sender outside of organization , there attachment > 1kb. 

it works efficiently, on (not all) emails it's shows when sender outside of organization there no attachment email?  curious on why displaying. outlook consider aspects of body attachment? 

does have idea?

thanks !

we signed atp licenses, , not longer using warning. 

thank help. 



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



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