Email data not accepted

I have cretaed a cron job for  Report workflows . Workflows are working and normal mail (ex:when added subscription mail alert) also working. And in workflow log also workflow status id showing as done.

but report mails are not receiving. In error log found this error.

help me to solve this error 


06/19/19 17:01:27 [13468][1][FATAL] PHPMailerProxy encountered an error: SMTP Error: data not accepted.SMTP server error: DATA END command failed Detail: STOREDRV.Submission.Exception:SendAsDeniedException.MapiExceptionSendAsDenied; Failed to process message due to a permanent exception with message Cannot submit message. 16.55847:89120000, 17.43559:0000000004020000000000000000000000000000, 20.52176:140FC3870D0000007E320000, 20.50032:140FC3877D17702040000932, 0.35180:83320000, 255.23226:0A000000, 255.27962:0A000000, 255.27962:0E000000, 255.31418:15000000, 16.55847:B6000000, 17.43559:0000000010030000000000006100000000000000, 20.52176:140FC3870D0040108 SMTP code: 554 Additional SMTP info: 5.2.0