Hi all! I have been using Office 365 to send automatic emails to potential leads and customers of my business. Lately, however, I am getting this error: 550 5.7.708 Service unavailable. Access denied, traffic not accepted from this IP. My IP is as normal as it gets. Does it mean I got blacklisted or something else is at play here?
5.7.708 Access denied, traffic not accepted from this IP : This error occurs when sending email from known, low reputation IP addresses that are typically used by new customers.
If you must send email from these low reputation IP addresses before you can purchase licenses, contact support to request an exception until you’re able to purchase licenses.
Hello,
Please follow the link below
https://answers.microsoft.com/en-us/msoffice/forum/all/550-57708-service-unavailable-access-denied/274f6e9e-9ecf-4122-ac22-adac97e3f337
