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One of the mail servers I’m administrating has problems deliving emails to addresses at, and

That’s quite irritating especially when all of the other major mail servers, Yahoo Mail, Gmail etc. do accept my qmail server messages in their Inbox.

Every email that is addressed to for example is returned back to my sender folder with the message:

Remote host said: 550 SC-001 Unfortunately, messages from weren't
sent. Please contact your Internet service provider since part of their network is
on our block list. You can also refer your provider to

Right after my mail server delivery problems were reported by one of my colleagues, the first step I took was check if my mailserver is listed in some of the major email blacklist databases on the address:

By opening the above url in a browser and putting a server IP, I was unpleasently notified that my mail server let’s call it with the fiction name is existing in the Spamcannibal blacklist dabase . Spamcannibal as most of the blacklist databases.

To completely reassure myself my server host IP is in spamcannibal, I’ve used spacannibal’s website whois on the url

Of course this proofed one more time I’m listed in spamcannibal… Thanksfully spamcannibal has a contact form which can be used to delist an IP address from their blacklist right from their website.

After a day of waiting my server IP was removed from spamcannibal blacklist and therefore using the’s website mail server blacklist checker I’ve assured myself the mail server is no longer in the most notable spam blacklist on the net.

I’ve gave another try to deliver an email to my hotmail mail account . The mail delivery was unsuccesful again, the qmail failure notice daemon returned my sent email to my once again with the error of:

Hi. This is the qmail-send program at
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

Connected to but sender was rejected.
Remote host said: 550 SC-001 Unfortunately, messages from weren’t
sent. Please contact your Internet service provider since part of their network is
on our block list. You can also refer your provider to

— Below this line is a copy of the message.

The situation by so far was that I knew for sure my qmail mail server IP is not listed in major spam black lists, but still i couldn’t say for sure that there was no minor blacklist where my ip figurates, neither I was completely sure about the exact requirements microsoft expects from my mail server.

Some of the presumed reasons which could think of could be the cause the hotmail mail delivery failure errors were as follows:

1. My mail server IP had no correct A domain name record or a PTR record

2. My mail server was missing a correct SPF record
3. My dedicated server ISP has some blacklisted dedicated server IPs which belong to the same IP range as the mail server

I’ve walked through each of the 3 expected reasons that might cause the failure but it appeared that my mail server was configured to fullfil each of the 3 aforementioned requirements.

To assure myself each of the failure reasons were untrue I issued the commands:

linux:# host has address
linux:# host domain name pointer
linux:# host -t TXT descriptive text "v=spf1 mx ptr -all"

Also I used the‘s SPF Query Validation tool located on to make sure my mail server SPF record is correct.

Another way to check if a mail server SPF records are correct is by sending a test email to for and check in the email headers.

(To check the email headers in Thunderbird you can press ctrl+U)
When the email source appears look for the field Received-SPF: pass (….
If the field says pass this means your mail server SPF is fine, if it reads uknown or something different this means it’s not fine.

Next you will have to call your ISP and have a tech conversation with the tech support.

As nothing of the above assumed possible failure was checked and I was sure the email server is not affected by them

Further on logically enough I’ve pointed my browser to the which which was prescribed in the reject email returned from hotmail’s mail server.

On that URL I red the meaning of the Remote host said: 550 SC-001 , Here is what it says:

550 SC-001 Mail rejected by Windows Live Hotmail for policy reasons.
Reasons for rejection may be related to content with spam-like characteristics
or IP/domain reputation. If you are not an email/network admin please contact
your Email/Internet Service Provider for help.

Ain’t helpful is it??! Well I think Microsoft has a tradition of unhelpful manuals and documentation since the yearly days so that hotmail mail server error code explanation wasn’t that unexpected 😉

As I was out of ideas, I joined and asked for help in #exim irc channel.
Thanks God, there was a guy with an alias cannonball who gave me a good hints which I followed.

First he suggested that I see and join Microsoft’s (Smart Network Data Services) they’re located on

Thanksfully the Smart Network Data Services could be accessed with my hotmail mail account, credentials, but after logging in to give me a real access to the site content I had to confirm, I’m a legit person and provide an legit email address where I can receive the confirmation.

As this went by in the I had to use the buttons Requert Access, View IP Status and View Data to check the status of my mail server IP address

After all this struggle in 1. Requesting Access to my IP, View IP Status and View Data I finally found out the guess what unexpected fact that Microsoft’s mail servers has blacklisted my mail server IP Address!, How unexpected was that, heh ?!

So to sum up all this effort of registering in Microsoft SNDS gave me not any further clue on what I can change in my qmail mail server installation to make the user emails deliver to

After a bunch of investigation on the net, I’ve found another post which discussess issues with the 550 SC-001 error reason for a failed mail server deliveries to microsoft mail services.

Thanks God the post I’ve found pointed out that Microsoft has an Eform for delisting / removing spam black listed mail server IPs not able to deliver to hotmail and

Click over the link above and you will be pointed to Microsoft’s annoying Eform for IP removal from their spam blacklist

The form needs to be filled and after that you can start praying to God to be merciful and push up Microsoft to have a good will and remove your IP from their mail spam blacklists.

The form filling takes about 20 minutes, there are plenty of information you will have to fill in the form but try to be as concrete as possible!

All the form fields are with () – asterisk and therefore are a required fields. After I filled up the irritating form, I’ve faced the horror of Microsoft’s Captcha!!!

Honestly I haven’t seen a more bad captcha in my life, I can’t read anything on it, neither I can perceive what word or number it is nor I can grasp whether the captcha shown letter is lower or capital… it’s really a terrible CAPTCHA I tell you! so beware and try to put all your patience in while filling it in.

What made it even worser this damned Microsoft’s IP removal form was the fact that it doesn’t work at all with Opera and Epiphany browsers.

I tried initially to use Epiphany and Opera to post the shitty form but it was no go, it could not post!!!
Thank you Microsoft for making your form a platform incompatible, I know you’re really good in that!

I finally launched IceWeasel (Firefox) and filled in the boring form once again and Thanks God this time it was properly posted as you read below:

Sender Information for Hotmail Delivery
E-mail SupportE-mail Support
Thank you for submitting your issue to Support.

Your Support Ticket Number:1151722088
For reference, please print this page or write down your support ticket number. Use this number when communicating with Support about this issue.
To make sure that you can receive a reply from Microsoft, add the “” domain to your e-mail “safe list”. If you do not receive a response in your “inbox” within 24 hours, check your “bulk mail” or “junk mail” folders.

Print the page? 😉 I guess Microsoft are not very green company as they suggest you to print it out ? 😉

Now I’m stuck into waiting and hoping that my removal request will be regarded and in a couple of days of time I’ll either hear a word from Microsoft’s tech support or directly get unbanned from their spam black list…. Pfuuu

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