Dec 22 2021 06:47 AM - edited Dec 22 2021 06:50 AM
Dec 22 2021 06:47 AM - edited Dec 22 2021 06:50 AM
I run a mail server for many business clients of mine. Microsoft have blocked our IP address, so we cant send to Office365 email addresses. I get a bounce back saying:
host cr-studio.mail.protection.outlook.com[22.214.171.124] said: 550 5.7.511 Access denied, banned sender[126.96.36.199]. To request removal from this list please forward this message to delist [at] messaging.microsoft.com. For more information please go to http://go.microsoft.com/fwlink/?LinkId=526653. AS(1410) [LO2GBR01FT022.eop-gbr01.prod.protection.outlook.com] (in reply to RCPT TO command)
(I have changed my server IP above)
So I emailed delist[at]messaging.microsoft.com but they said:
"I do not see anything offhand that would be preventing your mail from reaching our customers for the following IP : (188.8.131.52)"
And gave me various links to pages with different support channels. One of them was to login to admin.microsoft or something, but I cant do that as I dont have an account.
One of them was contact Microsoft support and they said its not to do with them, contact Office365.
So I filled in a form on sender.office365.com and they replied:
"The IP address in question is not currently blocked in our system. Please refer to the email message you received from Microsoft and follow the steps it suggests." - which I have done, with the first email above!
I also filled in the form for emailing Live, Hotmail, Outlook.com and got no reply but dont think its to do with them.
So I am very confused at the moment with all the different support channels, various Microsoft support telling me they cant see a reason for the block and then doing no more about it.
I have no idea what the correct channel is and how to fix this, does anyone know? Its a bit of a shambles Microsofts side of it to be honest.
Dec 23 2021 03:38 AM
Dec 23 2021 03:45 AM
@suportecw We have the same problem too. I've requested delisting via the website but it responds there is no listing for the involved IP. Next try is send the error message to Email address removed -> but according to the automated response it can take up to 24h
MS found a great way to increase their marketshare it appears ...
Dec 23 2021 03:59 AM
Dec 23 2021 08:00 AM - edited Dec 24 2021 05:41 AM
Yes started last Tuesday for me too. First time I knew about it was 7:30am GMT.
Dec 24 2021 02:39 AM
Dec 24 2021 05:43 AM - edited Dec 24 2021 05:44 AM
I have a Microsoft support engineer helping me. He emails and calls often. So it’s good there is someone BUT I don’t understand why they can’t find the problem. He keeps asking for me “try again” but it’s not fixed. They can’t see my IP in a blocklist. It’s very strange but also unbelievable no one at Microsoft can find the reason. We’re on the 3rd day of blocks now and due to Christmas I doubt it’s a priority for them.
Dec 25 2021 01:00 AM
Dec 25 2021 03:10 PM
Dec 26 2021 10:45 PM
Dec 27 2021 02:25 AM
Dec 27 2021 03:36 AM
Dec 30 2021 02:16 AM
@timbertens I have contacted Linode multiple times on this issue. To be honest, I am disappointed with their response. It seems there is nothing they can do.
I'm also not really getting anywhere with Microsoft so far. Hopefully this issue is now being escalated.
Dec 30 2021 03:25 AM
Dec 30 2021 03:31 AM
Dec 30 2021 07:31 AM
@AmityWeb2021 How did you do that? perhaps that would be a solution until Microsoft wakes up from their deep slumber. Is there any documentation on how to setup a new smtp using a different IP?
I have had many responses from Microsoft saying they are escalating the issue, but nothing happens after that. very very disappointing.
Also I am sure that Linode IPs are all blocked because I have a server with Linode with no emails ever being sent from it for the past 2 years. I set up a totally new account and an unused brand new domain and tried to send to a Microsoft365 email account, it was blocked.
Linode should do something about this, as well as Microsoft. Otherwise I will have to just move to a different data center, perhaps DigitalOcean?
Dec 30 2021 07:41 AM - edited Dec 30 2021 07:42 AM
@bootahit depends on your current mail server... as I run my own server I have full control over it. So I can modify postfix's config files. The smtp.com article how to do it is here https://kb.smtp.com/article/944-postfix. I used to use Sendgrid some time ago, and its the same principle. In fact, I guess any 3rd party SMPT service can be used. It results in Postfix sending ALL email on the server through another SMTP account. My users still connect to their email accounts on our server, so they dont need to change any settings, but then our server uses another SMTP account to send them. That account would then have a different IP and is not blocked.
Dec 30 2021 07:44 AM
Dec 30 2021 07:46 AM - edited Dec 30 2021 07:49 AM
Yes they would mostly have a fee. I dont know of free ones, or if they were any good. This is why its temporary for me, I dont want to keep paying the additional cost. The cost will depend on how many emails you send through it per month. Its not a big cost even up to 100,000, but as its a business service I provide, so my customers pay me, I have no choice than to pay to get it working until Microsoft find someone who knows what they are doing.
If the cost is high, an alternative is create another server just like your mail server, if the cost for that is much less than sendgrid etc. and send through that. I think you can send through any server an email account to send through (I think, I have not tried it but dont see why not). Although it gets a bit advanced then because smtp.com have done something with the return path in order to link the sending to the originating domain SPF record which is important to not get caught as spam.
Dec 30 2021 01:58 PM - edited Dec 30 2021 01:59 PM
Linode support has kindly digested me this far and I am surprised to see how many people affected.
I have several servers affected in London and Frankfurt.
anyone with an email server in Linode US affected here?