Starting this past Monday, February 23rd, I've been facing issues with sending bulk emails to Outlook, Live, MSN, and Hotmail domains. The error message reads: "451 4.7.650 The mail server [X.X.X.X] has been temporarily rate limited due to IP reputation." It's become apparent that a lot of us are seeing similar problems. Has anyone else encountered this, especially in the last 24 hours? I'm concerned because it seems like we've hit a wall in our email deliverability.
4 Answers
I’ve noticed the same issue when sending emails to hotmail/outlook/live domains. Even with consistent email traffic, I've been getting hit with rate limiting. It seems to affect predominantly those domains—my other 365 users don’t seem impacted.
MXroute is reporting significant problems, too. There were over 3,000 failures out of nearly 50,000 attempts. It's definitely not just you. This seems to be impacting multiple providers and setups without any clear resolution from Microsoft in sight.
Yep, I’m dealing with the same issue! A bunch of us have come together in a thread to flag this to Microsoft. There’s also a support service where you can appeal delivery issues, but many of us have just gotten generic responses saying there’s no problem. Definitely fill out the form and keep an eye on the thread!
We’re running into the same problem. We use Sendgrid and have several dedicated IPs, sending around 100K emails monthly, with a significant chunk going to Outlook. Since February 24th, all our IPs have been flagged. It’s frustrating!
Thanks for the update! I hadn’t heard about the MXroute situation before.