Microsoft rejecting emails as spam

Microsoft blocks emails from legitimate sources

Once again in the war on spam, there are friendly casualties. Many users are reporting that their emails are not getting through to Hotmail and users. Some of our clients are reporting that they are not receiving emails to their Microsoft email addresses from us. This of course risks users not receiving important emails about their domains and services.

Microsoft’s latest change to their spam checking software has resulted in a new email rejection notice being sent. Many legitimate users who are sending important emails to Hotmail and email users are not getting through.

The new notice reads: rejected your message to the following e-mail addresses: ( gave this error:
Unfortunately, messages from [] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3140). You can also refer your provider to []
Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery.

Microsoft spam blockers

What does it show us

The notice shows that they are using some of the doggy block lists that have been around for many years. Generally these block as much legitimate email as they do spam. They are not at all the best way to reduce spam in an email system. At the time of writing the above address for removal from the list is not working. We are therefore unable to get our IP addresses removed from their list.

How should they stop spam

No-one can deny that spam is a bad thing, particularly the phishing emails that allow hackers to hack your email account. These emails should be stopped but this is not the way to do that. This is a very lazy way to block spam. Considering the amount of money that these large companies make from the so-called FREE services, they should invest some of it back in to the service. Make the spam filtering better, don’t block everything.

It is still unclear as to whether or not you will have to pay to be removed. The normal block lists of this kind offer a “service” to be removed from their block lists when your IP address falls in to one of their ranges. Bearing in mind that ISPs may have tens or even hundreds of thousands of IPs and in some cases millions of IP addresses in their range which they then sell to or use for clients. If one of these IP addresses is suspected of sending spam then the entire range can be blocked causing major problems for businesses. Their intent is to get businesses to petition the ISP to stop the spam from going from their network.

What should you do

If you want to get decent spam filtering without losing important emails, then we recommend that you use this service for your spam and virus checking. If you use Hotmail or then we recommend that you change your email provider to SecuredMail.App.  You can optionally have an email sent to you with all the emails that are considered to be spam. That way you will never miss an important email. No bulk IP address blocking, however you can set geographical policies. Very powerful, easy to use and accurate.

Stay safe

CritchCorp Support

Comment (22)

  • Silvia| 18 September, 2020

    Buenas tardes 🙂 me ha encantado el post, no me gusta comentar pero en esta ocasion pongo uno! Me gustó mucho tu blog 🙂

  • Dimitry| 14 September, 2020

    Next time I read a blog, Hopefully it won’t fail me as much as this one. I mean, I know it was my choice to read, however I really thought you would probably have something useful to say. All I hear is a bunch of complaining about something you can fix if you weren’t too busy searching for attention.

    • CritchCorp| 25 September, 2020

      Hi Dimitry,

      Thanks for your comments. As you may see in the post we had tried at that time to fix it but their system was not working. It was not just us that had the issue either, many people have and still have a problem.

      Come back soon, we appreciate all comments.

      Keep Safe

      CritchCorp Support.

  • Karla| 10 September, 2020

    Having read tnis I believed it was rather enlightening.
    I appreciate you spending soe timne and effort to put
    this article together. I once again find myself spening a significant amount of time both reading andd leazving comments.
    But so what, it was still worth it!

  • Tarlln| 28 August, 2020

    I am glad I found this as i have been having trouble sending emails to some of my customers.

    thanks for the news.

  • Samuel| 20 August, 2020

    Spot on with this write-up, I truly feel this website
    needs a great deal more attention. I’ll probably be back again to see more,
    thanks for the info!

    • CritchCorp| 22 August, 2020

      Hi Samuel,

      Thanks for your comments, we are glad that you enjoy reading our articles.

      Keep Safe

      CritchCorp Support.

  • Wilbert| 20 August, 2020

    Howdy, i read your blog occasionally and i own a similar one and i was just
    curious if you get a lot of spam feedback? If so
    how do you reduce it, any plugin or anything you can advise?
    I get so much lately it’s driving me mad so any support is very
    much appreciated.

    • CritchCorp| 22 August, 2020

      Hi Wilbert,

      We have some secrets for dealing with that. Create a shop account and then get in contact and we can discuss further.

      Keep Safe

      CritchCorp Support.

  • Dulcie| 20 August, 2020

    Hi there this is kind of of off topic but I was wondering if blogs use WYSIWYG editors
    or if you have to manually code with HTML. I’m starting a blog soon but have no
    coding knowledge so I wanted to get guidance from someone
    with experience. Any help would be greatly appreciated!

    • CritchCorp| 22 August, 2020

      Hi Dulcie,

      Most have some sort of editor, you may need some help getting it setup to look like you want it but once it is going it will be easy to maintain.
      Get a WordPress website and then submit a support ticket and we can help you to get it setup. If you would prefer to use something different to WordPress, then you can try one of Feature Rich Hosting Accounts.

      Keep Safe

      CritchCorp Support

  • stewart| 18 August, 2020

    Great post, pleasepost some more.

  • William Dox| 3 August, 2020

    I hate it when this happens. It has happened to me many times.
    People should get off hotmail (and They block legitimate emails all the time and the spam still gets through.

  • Mike Gate| 31 July, 2020


    Why does this happen? You would think that in this day and age they would be able to tell what is spam and what is not.

    thank you
    Mike Gate

    Monkey Digital

  • Heather Wah| 26 July, 2020

    Dear Sir/mdm,

    How are you?

    We use gmail and find it to be the best solution for our business. We would not use microsoft.


  • Miriam failm| 24 July, 2020

    I am using gmail, is that a good one to use?


    • CritchCorp| 5 August, 2020

      Hi Miriam,

      gmail can be good for personal use, although we prefer something that you have control over. Whilst it is unlikely that Google will pull the gmail service, you don’t own your account or your email address and so we recommend that you get your own domain name, which you will then own and can use wherever you like. We have some exciting email options at really good prices. Take a look at the options here:



  • Joseph Stewart| 24 July, 2020


    I am constantly having trouble with my emails being rejected to hotmail users. Does anyone know a good email service to use?