A couple of months back, my hosting provider, IONOS, switched my server's IP address. After the change, I found that every time I tried sending emails to Hotmail or Outlook addresses, they bounced back with a '550 5.7.1' error. I suspected that my new IP was blocked by Microsoft, so I filled out a request at sender.office.com to have it delisted. Although I received confirmations saying the IP was delisted, the issue hasn't been resolved in the two months since. I've even checked 30 minutes and 24 hours later after each delisting request, but the emails still get rejected. Is there anything else I can do to get my IP unblocked?
5 Answers
If you're determined to make this work, you might have to rehabilitate your IP. Try emailing yourself from your Hotmail and respond to those emails. Keep pursuing the delisting process too. Just ensure you've got everything configured correctly with SPF, DKIM, and a strict DMARC policy. Persistence pays off!
Honestly, it might just be easier to switch to a different IP altogether. I had an IP that was blocked in Saudi Arabia because it was a Tor node from years ago. IP reputation can stick around a long time, so a new IP could save you a lot of hassle.
You should check your IP against sites like mxtoolbox.com to see if it’s still on any blacklists. Honestly, I’d think about not hosting your own mail server anymore since many VPSes get blanket bans due to past abuse. Some providers even block port 25 altogether.
First off, did you set the PTR record for your new IP? It’s pretty important for mail servers. If not, you might want to look into that.
Sure did.
Running your own mail server these days is just asking for trouble, especially on shared hosting. Make sure you’ve got your SPF, DKIM, and DMARC set up right. They’re all super important for deliverability, but you might just be experiencing some bad luck with your new IP.
Actually, I have a dedicated IP that isn't shared among other accounts. My previous IP was in good standing; it’s just bad luck with this one.
Thankfully that IP is clear on all of the blacklists there.