Hotmail Blocking my IP Address?

I have an At&T account and recently sent an email to a friend with Hotmail. Several minutes later, I received an error message from my postmaster saying this: Permanent Failure: MAIL FROM: <*************> 550 REPLY: 550_SC-004_Mail_rejected_by_Windows_Live_Hotmail_





from_that IP_address._



> Delivery last attempted at Wed, 7 Oct 2009 14:13:14 -0000

I have not sent spam to any of my friends using Hotmail or anything else. I don't even forward those cheesy jokes my friends send me :) Please help!! I am going Crazy!!

6 Answers

  • 1 decade ago
    Favorite Answer

    This is happening all over. Apparently Hotmail decided to block all email from bellsouth users until spam issues are addressed. I spent all yesterday morning trying to figure it out.

  • Anonymous
    1 decade ago

    You will ultimately want to contact your ISP regarding this. You'd do not necessarily have malware as your IP address could be a shared IP address with others on your network (depending on how your network provider hands out IP addresses). You will want to check your IP address at and then enter in that IP address at

    This site,, will tell you all of the blacklists your IP address is on. Then you should pass that to your ISP to handle as you cannot submit delisting of an IP address unless you're the owner of it according to a WHOIS report.

    Hotmail will then determine if the block should be lifted or if it should remain. If they blacklist you manually for spamming, they are a lot tougher to get off in my experience.

    -Ryan M., Server Engineer @

  • Anonymous
    5 years ago

    Yes, i've had this before when testing a web service for one of my users - i was sending too many emails test emails in a given amount of time and did not have a valid email address set as the originator. Hotmail and Gmail thought I must be a spammer, and blocked me, it was just a case of contacting them to reset the ban.

  • Anonymous
    6 years ago

    The absolutely free reverse email lookup sites generally provide false information, they just want your email to send you spam. To get real information, money will have to be paid.

    Also, stay away from shady reverse email lookup sites, most likely you won't get any information after you make the payment. Not to mention you won't get a report and you won't get an answer if you try to call for a refund. Stick with a reputable reverse phone lookup site like that has been around since 1997.

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  • 1 decade ago

    Congratulations... you're infected with malware.

    Your machine has probably sent at least 100k spams, since Hotmail is extremely slow to filter things.

    You may want to look for your IP on to see if you're on one of the larger blocklists.

    Stragely enough, back when I was running email campaigns, I had my mailer set to check proxy IPs against this. It's a very useful tool.

  • Anonymous
    6 years ago

    Find name and email address history with

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