Add EU to the International Blocked TLD List

Last reviewed on September 20, 2014   —  44 comments

Several users wanted to block the top-level EU domain.

95% of my spam is coming from the EU TLD, but I can't find any way to block this stuff in Outlook's 'Junk E-mail Options'. For some reason "EU" isn't among the TLD's listed in International - Blocked Top-Level Domain List. I haven't found any way to add at TLD to the list.

I've also experimented with trying to catch these EU emails with a filter, but with no success. Is there any documentation about the use of wildcards ('*') in the search words of Rules (e.g. in Sender Address)?

Correct, EU isn’t on the Blocked Top-Level Domain List; .EU was launched in 2005, the International filter was added to Outlook 2003 in SP1, circa 2004. (UK is not on the list either, only GB.)

Block top level domains

Search doesn’t support wildcards, so while you could look for .EU using a rule that looks for words in the header, there is a risk that it will trap legitimate email that just happens to have .EU in the header. You can also filter for sender domain, see Create rules that apply to an entire domain for the instructions. (EU is not used in many words so the damage such a rule may do shouldn’t be too great for most people.)

Filter EU using the International blocked list

Note: this adds EU to the Junk mail filtering capability, it does not add EU to the list of domains in the Blocked Top-Level Domain List. Only Microsoft can add EU to the dialog.

The International TLD’s you select in the Junk Email filter are stored in the registry under the profile key and you can add EU to the filter's blocked list by editing the registry. (The value name is not added to the registry until you block at least one International TLD.)

If you’re using Outlook 2013, the profile is stored at HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Profiles\<profile name>\. The International blocked domains list is stored in a separate key for each email account in the profile. Search for 001f0424, you’ll find this value name under a different key for each email account that blocking at least one TLD.

Outlook 2010 users will find their profile at HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\<profile name>\. As with Outlook 2013, the International blocked domains list is stored in a separate key for each email account in the profile and it's easier to find it by searching for 001f0424.

Outlook 2010, 2007, and 2003 profiles are stored at HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\<profile name>\. The International domains list is stored in the 0a0d020000000000c000000000000046 key, under value 001f0424.

This is a binary value and while it is editable, it’s not as simple as just typing in EU in the edit dialog. The easiest way to edit it is to add a TLD to the list that you don’t want blocked (such as ES) then select the individual letters to change them. Remove the letter by backspacing over it then type in E or U. For example: if you replace ES, select the S and type U. If you need to replace both letters, replace one letter at a time, you cannot select both letters in a TLD and type "EU".

Type over one letter at a time

If you want to block all domains, or you just want to be geeky, you can type the binary values in on the left. Click after a 00 and type 45 00 55 00 3B 00.

add EU to the registry

If you later edit the list using the Junk Email Option's Blocked Top-Level Domain List dialog, EU will be removed and you’ll need to re-edit the registry.

Add EU to the International Blocked TLD List Tutorial

If you want to block all UK messages (which I don’t recommend), you’ll need to add UK to the list as the GB selection does not block UK. (I also tested this with the INFO TLD and it didn’t work, you'll need to use a rule to block domains.)

Remember, if you have more than one account in Outlook 2010 or 2013, you’ll need to edit the registry key for each account, as each account has it's own junk mail options (and blocked/safe lists). The value won't be created for an account if you don't enable international filtering for that account.

More Information

How to check Junk Email settings for each account in Outlook 2010 and up: If you are using separate data files, select a message and look at the Junk, Junk Email Options, International tab. If you are delivering to one pst, open a message from each non-default account and choose Junk, Junk Email Options. Repeat for each account. The title bar on the dialog will show the name of the account whose junk settings you are looking at. For more information and screen shots, see Using Outlook's Junk Mail filter.

Written by

Diane Poremsky
A Microsoft Outlook Most Valuable Professional (MVP) since 1999, Diane is the author of several books, including Outlook 2013 Absolute Beginners Book. She also created video training CDs and online training classes for Microsoft Outlook. You can find her helping people online in Outlook Forums as well as in the Microsoft Answers and TechNet forums.

Please post long or more complicated questions at Outlookforums.

44 responses to “Add EU to the International Blocked TLD List”

  1. Rick Spiewak

    Thanks, Diane!

  2. James Moren

    thank you very much, just tried your fix and it works!

  3. Bruno V

    Why on earth would you do this or advise someone to? Many legitimate businesses in Europe have a EU extension. That includes us and we do also business with US-based companies. Are you serious about wanting to block them all and this being rooted in the registry? Many people and businesses install rules of which later the existence is forgotten (or of which users within the company are never informed) and then wonder later why emails don't come through.
    Incidentally, of all the spam we get, I have hardly ever seen one coming from an EU extension. Is this 90% fact or myth?
    Blocking eu and thereby blocking companies from an entire continent is like blocking all American companies (idf there would be an extension allowing that). I am seriously puzzled.

  4. Richard

    Diane, Thanks for addressing the problem of adding TLDs to the list. But with respect, I have to say that the information given here in both print and in your video are extremely confusing. I have used the TLD list before and am familiar with editing the registry. But I have read and re-read your tips on this subject multiple times and still don't understand it. Is the reg edit supposed to replace ES with EU in the TLD list (it does not)? Or does the ES check box now serve as EU, even though it still displays ES... unclear???

    Also, I'm completely lost on what you are doing in the point about 'Blocking all other domains' and typing in the numbers to the left? Really, what the hell are you talking about? Would sure appreciate some clarification for us dunderheads.

  5. Dave

    Your instructions were very clear -- I followed them and tried testing blocking of EU TLD, but the test messages from "" went into my inbox. I double-checked the registry and it was correct according to your instructions . . . so this does not seem to work.

  6. Chuck S.

    Thanks for sharing - a lot of spam from .eu and .me domains. Once we change the registry, will the domains appear in the Blocked Top-Level Domain List?

  7. Joe Pagliarulo

    Great stuff. Did it.. let's see if it stops the 200 spam email I get from .eu!

  8. Joe Pagliarulo

    Unfortunately, it did not work. Not sure what the issue is. When I check the international blocked list ES is unblocked -- I'm guessing because I changed it to EU in the registry. But in 2 minutes, 2 .eu emails came in.

  9. Joe Pagliarulo

    yes.. it's now unchecked.. do I check it now that I've changed the value?

  10. Joe Pagliarulo

    Do need to reboot after the registry change perhaps? Or just restart Outlook?

  11. Joe Pagliarulo

    okay.. not working. Not sure what else to try. This is my public work email and I need to be able to use it.. but, I'm getting inundated.

  12. Joe Pagliarulo

    I'm definitely in the account where I'm having the issue. Yes, the from addresses are all different -- with different domains but all with .eu. I have unclicked all of the top levels. Deleted the keys.. clicked just one top level.. ES and went into the newly created key and have changed it to EU. We'll see if that does it. How did you make an eu account for testing? Thx!

  13. Joe Pagliarulo

    update.. got a .eu and it went straight to junk. Might have been the old registry.. and my update to 2013. Clearing out the key and rebuilding worked. Thx!

  14. Joe Pagliarulo

    Oddly.. worked on my laptop.. not my desktop

  15. Joe Pagliarulo

    so weird.. same thing.. Perfect on laptop.. is not recognized as junk on desktop.. Can't figure it out. ;)

  16. Dave

    I'm using Outlook 2007 SP2 and there is no "001f0424"

    ...And, to Bruno V the "why I would do this" is very simple: I get 60-100 emails per day with the TLD .eu. None of it is relevant. Seems to me it is the responsibility of legitimate .eu entities to insist on regulations to stop this gross misuse...and I hate regulations!

  17. Joe Pagliarulo

    Okay.. he's how I was able to get it solved. On the laptop.. changing one binary worked great. Did not work on the desktop. I went as far as deleting all of my profiles and .psts and starting over. Still didn't work. Then I added E U (45 and 55) to two different keys and that, for some reason, took. Blocked 73 .eu spam emails already today. Thx so much for this! jp

  18. Bruno V

    Joe, I understand your frustration, believe me. Yet, want to know how many SPAM and otrher unsollicited emails I get daily from .com addresses? Consider yourself lucky that you can block .eu ; for us blocking .com would mean like blocking the buggest chunk of all legitimate emails...

  19. Steve Rosenthal

    Its not working for me, I do not have the key with the value "001f0424" in my registry. I am running Outlook 2010. I have tried first browsing to the directory and then searching for it.
    Is it known by any other name?

  20. Steve Rosenthal

    Thank you for getting back to me....Yes- the instructions are so easy to follow, both written & video, but after adding several domains - the key doesn't not exist. Wish I could post a snip of what I'm seeing...

  21. Donald Krishfield

    Couldn't find "001f0424" until I selected Inbox went to the Junk E-mail options for International blocked Top-Level Domain and cleared them all. Then, after setting the domains under individual email addresses, "001f0424" showed up in my profiles and I was able to use your wonderful information. Thanks, Thanks, Thanks.

  22. Richard Laycock

    I followed the instructions and I've made the changes to key 001f0424. It has yet to properly block the eu domain. I'm using Outlook 2007. I searched in regedit for other instances of the key but there's only that one. I do have four accounts but not a single one seems to be filtering the euro spam.

    What do you think?

    1. joe

      It appears to me, this is Case Sensitive. As Caps and small gives you different number. i added both, keeping my hands crossed.

  23. Richard Laycock

    BTW, I saw that comment about Outlook 2007...

    You need to add at least one domain to the international list to create the key. Outlook 2007 will have it on the *0046 key.

    I don't know if you intend that * as a wildcard or what but I don't find anything searching my Registry for *0046 nor any key in the MS Outlook section with 0046.

    I'm using 2007 but I definitely have the 001f0424 key. It has been modified. It now reads in the key's letter display E.T.;.E.U.;.U.S.;... When I open Outlook though the TLD list only shows ET & US checked. Now that, I understand is normal, but it should work right?

  24. Richard Laycock

    Ah, the Outlook Profile *0046. I see. That's where I've got the 001f0424 already set. It's identical to what you have int the Reg text file.

    Here's a link to a snapshot.

  25. Richard Laycock


    Here's a snapshot of my accts..

    I had .eu and .us also places as "Rules". They didn't work but I'm wondering if that could have anything to do with it. Unlikely since the US check in the TLD works fine.

    Most of the EU spam comes in overnight. I'll see how it works then. I haven't figured out how you did that "mail test message".


  26. Paul Whitesman

    I have tried to block .us for years. I have tried everything to do it *.us @*.us @** but nothing seems to work I have checked the .us box on rhe BLOCKED TOP_LEVEL DOMAIN list but nothing seems to work. Can you make another video for blocking .us domains please?

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