This occurred a few days later, on November 3rd. This occurred primarily on October 29th and 31st.Īs a result of this malicious behavior, Microsoft's mail protection teams saw a spike in bounce rates (and a few spam reports), and by comparing the delivery volume during these events to our baseline volumes, Microsoft decided to blacklist on of our IP addresses. What happened?Ī spammer compromised a system/server outside of Accelo, and then used our trust of this system's pathway for email delivery to select mail domains (including Hotmail, Live and ) to then use us to deliver over spam emails to primarily email addresses. ![]() The short version is that someone took advantage of our trust and we then delivered some email for them which cost us a lot of time and money. ![]() No Accelo systems were breached or client data exposed. ![]() The root cause of these issues has now been identified and addressed, and while our engineering team has already ensured this specific situation won't occur again, we'll be putting in place more proactive monitoring and reporting systems so we can catch compromised or malicious users in future before they can become a problem. Over the last few days we've had a number of issues delivering emails to Microsoft's consumer email services at Hotmail, Windows Live and.
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