NDR '550 5.7.705 Access denied - Microsoft Community


moved our email our own exchange server microsoft 365.  outbound emails bounced same 550 5.5.705 access denied error.  checked blacklists on mx toolbox , clean.  seems blacklist issue @ microsoft can't seem anywhere support on last 24 hours.  suggestions on how resolve it?

hi itatltd,

thanks reporting this. suggest use admin account log exchange admin center> protection> action center> check whether users in blacklist.

here article reference: removing user, domain, or ip address block list after sending spam email.

if suggestion above doesn’t help, please share tenant information further troubleshootings.

to protect privacy, have sent private message you.

you can click following link access it: https://answers.microsoft.com/en-us/privatemessages/list/.

best regards,

vanessa



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



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