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Mailserver blocked by Brightmail at Microsoft but cannot delist

Created: 26 Aug 2013 | 6 comments
ojcs's picture

Hi. My mailserver has been blocked by Microsoft and my customers can't send mails to,, etc. When I use Microsofts SNDS tool to look up my IP address, it says I've been blocked by Brightmail. However, when I use the specified delist page ( it says I'm not listed! Anybody have any similar experiences/advice?

Operating Systems:

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BenDC's picture

I would suspect you are on another list not maintained by Symantec.

TSE-JDavis's picture

Are you sure that you are checking the correct IP address? If you send an email to, they will respond with the IP address that they see your email from, which would be what Microsoft have blocked.

Maropost's picture

Hello BenDC and JDavis,

We are encountering a similar problem however 4 of the ips keep getting blocked over and over even though we have over 300 sending the same mail.

Any advice on how we can resolve this, its our first issue in 3 years.

Maropost Postmaster

kcyg17's picture

Our IP block still in list. Not sending emails to hotmail.

what should I do for delist and sending email to hotmail ?

MonicaDM's picture

You may also try looking at the website It will show all IP addresses associated to your domain name and it will show all the blacklists that have that IP address listed. You can then request removal from each of them according to their websites.

You may also check the IP addresses at

If this does not resolve the issue or if you continue getting blacklisted, you should consider opening a support case as there may be a spam bot or something along those lines in the network. If that is the case, you would need to work with your AntiVirus provider to make sure the network is clean.


kcyg17's picture

Thanks for your response.

But our IPs is clean the We are not any Blacklist.

I'm looks at this

But no any information for " delist ".

And I'm not knows to troublemakers domain or email address.

I'm created a support case but not give some information for my own problem.