Digital Ocean on outlook blocklist?


anyone else getting bounces from trying to send to outlook addresses? Seems like they are blocking a large network address range, and my poor Digital Ocean box got mixed up in it.

contact your Internet service provider since part of their network is on
our block list (S3140). You can also refer your provider to
[] (in reply to MAIL
FROM command)

At least they are bouncing, so I could send my reply via another email account :slight_smile:

Doing a search with mxtoolbox shows the ip is in a block on “UCEPROTECTL3” list because of a range being reported. But doesn’t seem to be on any other block lists.

Anyone know if Digital Ocean has some way to report something like this? I guess not, but maybe someone has done this before?

UCEPROTECT3 is a scam. They list ranges and then extort money for delisting. Smart companies such as Digital Ocean do not give in and pay.

To me, the fact that Micro$oft uses UCEPROTECT3 shows that they do not have their customer’s best interests at heart.

Honestly, the saying that “friends do not let friends use gmail (and outlook) is so true”. Both companies make their own rules and bully the small guy to stifle competition.

1 Like

Hi alento. Thanks for the info :slight_smile:

You’re welcome! Sadly, it doesn’t help you or the 1000’s of other Digital Ocean users out there. :frowning:

am on digital ocean and not blocked.

as per many similar post out here, rely to them and ask them to unblock your IP.

Same here, I’m on DO and outlook users get my mail…


I think to properly quantify this we need to look at specific DO locations, as not all of their networks had been added to UCEPROTECT3.

The other consideration is that listing on the UCEPROTECT lists expire after 7 days if the spam activity ceases.

Current UCEProtect report for one of my box, and it has been on for months, but it did not affect my mails to all major providers

True, my DO droplets are located in AMS. Local to myself…

Switching location is easy as creating an image and rebooting on a new droplet in a new location. Perhaps we can find out which locations are “clean”.

Seems the UCEPROTECTL3 removed the range my box is on - before I could find the right way to contact outlook/digitalocean/UCEPROTECTL3 about it. Got lucky this time I guess.

Seems outlook/hotmail are still blocking it. Maybe it will fix itself in time… haha.

Hi all,

I am on DO in AMS too, and my IP is thus also blocked un UCEPROTECT[23]. I have my MIAB running for over six years on the same IP. We send mail to customers mainly, and do not send out bulk mails like newsletters or advertisements. We have a dozen domains running on our MIAB instance, and everything works well, except towards Microsoft domains and a German provider I tried to get unlisted on Microsoft a while ago, but after three weeks and four or five different guys telling me that my IP was blocked but they were not allowed to tell me why, I gave up and added a relay towards these domains via transport_maps. The one I use is SendGrid. Since we do not send too much mails to Microsoft domains, we are on the free tier (max. 100 mails/day). I must say that everything works nicely, and setup is no too difficult.

Hi heinsaris,

thanks for sharing your experience and work around! Seems there’s a number of other posts on this discussion formum on how to use transport_maps. Reading some of the guides on the web they’re all doing it to work around being blocked by outlook/hotmail… hehe.

I send very few emails, so one of these free plans would work for me too.


It’s not difficult to get unbanned from outlook, you just need to prove you are not a spammer, OR your ip is newly acquired and the old spamming IP don’t belong to you.

This is probably a standard process everytime you set up a new mail server or acquired new IP address.

This is the standard reply from outlook/live/hotmail which will throw you off thinking this is the end.

You can request for unblock here -

We have completed reviewing the IP(s) you submitted. The following table contains the results of our investigation.

Not qualified for mitigation
IP address
Our investigation has determined that the above IP(s) do not qualify for mitigation.

Please ensure your emails comply with the policies, practices and guidelines found here:


Send a reply. Only real spammers give up on the first try.

<< IP address >> is our own business and personal email server, with
controlled user creation access.

This is a newly acquired IP address.

This server is used solely for the purpose of mailserver, with ssh
access only granted to an administrator.

The server is also configured with all the necessary records to ensure
only authenticated users connected to our secured smtp can send mails
from our domains.

Please help us to unblock our IP

Outlook/live/hotmail standard replies.

They will send a few email templates as follow, just need to give them what they want.

My name is BLABLA and I work with the Deliverability Support Team.

Your IP (SOMEIP) was blocked by because Hotmail customers have reported email from this IP as unwanted. One possible explanation for this is the automatic forwarding of unfiltered inbound messages, including unwanted messages, to addresses.

Please confirm that your emails comply with Hotmail’s technical standards. This information can be found at


Since you have mentioned that the IP: (YOUR IP address) has been newly acquired we request you to provide the proof which shows the IP address that has been newly assigned to you along with the exact date of purchase.
The alternate way is we need a confirmation from your Host/ISP, an email stating about the IP address that was assigned and the date of purchase.
I hope that the information I provided you was helpful. You may also find additional information on common delivery questions at the Postmaster site found at


Thank you for your response, we are yet to receive the information from you.

We would be very happy to support you, if these IPs are been newly acquired, we request you to provide the proof (Invoice copy, Email trial) which has the IP address that has been newly assigned to you along with the date of purchase.

Now things will get easier.

Send them a

  • A copy of the receipt stating when your VPS was purchased (started), together with the VPS Name + IP address. If IP is not in the receipt, take a screenshot of your web control panel or something.
  • OR email your provider if the provider’s receipt and online panel are unable to provide the information you need.

You just need to get the necessary information to prove you are the new owner of your shiny VPS + IP.

Your IP Unblocked.

You usually won’t have problem getting unblocked. My unblock rate is 100%.

Thank you for contacting Deliverability Support team.

We have conducted our investigation and applied the required mitigation for your IP: < IP address >. This process may take 24 - 48 hours to replicate completely throughout our system.

Thank you Deliverability Support

Remember to keep the correspondence.

In one of my setup, the mitigation was accidentally reversed (probably when they were doing network maintenance) and my IP was blocked again. I was able to shorten the entire unblock process by just letting them know my IP was mitigated before.


Dave!!! Please repost this as a new thread with the title “How to get unblocked from Microsoft” (or similar).

This REALLY deserves it’s own top-level thread! @daveteu

I had no joy getting unblocked by AT&T and (Microsoft).

Gave up and I send mail to them through a 3rd party. This is not desirable but I need to be able to deliver mail to these domains.

There’s a very recent post + AT&T support specialist’s official reply on how to unblock from AT&T