Mail failure - Microsoft Community


delivery has failed these recipients or groups:

when sending mail <email address removed moderator>it shows.

your message couldn't delivered because weren't recognized valid sender. common reason email address suspected of sending spam , it's no longer allowed send messages outside of organization. contact email admin assistance.







diagnostic information administrators:
generating server: bmxpr01mb0709.indprd01.prod.outlook.com
<email address removed moderator>
remote server returned '550 5.1.8 access denied, bad outbound sender'
original message headers:
authentication-results: gmail.com; dkim=none (message not signed)   header.d=none;gmail.com; dmarc=none action=none header.from=airtelmail.in;  received: bilal (182.64.187.46)   bmxpr01mb0709.indprd01.prod.outlook.com (10.174.215.142) microsoft smtp   server (version=tls1_2, cipher=tls_ecdhe_rsa_with_aes_128_cbc_sha256_p256) id   15.1.1075.11; mon, 8 may 2017 07:22:41 +0000

hi v.automat,


i have removed email address protecting privacy.

based on error message, suggest log into exchange admin center via admin credential, , click protection> action center to check if account blocked. 
here article reference: 
removing user, domain, or ip address block list after sending spam email.


looking forward update.


regards,
lance



Office / Outlook / Other/unknown / Office 365 for business



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