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What is 'Blocklist 1, mail from IP banned'

Discussion in 'Networks & Internet Connectivity' started by Domo, Aug 18, 2011.

  1. Domo


    Joined: Feb 11, 2004

    Posts: 3,867

    Location: Surrey, UK

    All emails we send to a specific company are returning this message:

    xxx x.x.x Service unavailable; Client host [xxx.xxx.xx.xxx] blocked using Blocklist 1, mail from IP banned; To request removal from this list please forward this message to delist@messaging.microsoft.com.

    Up until this week we could send OK. Same thing happens when using Internet Email or web mail (e.g. Hotmail, Just Host etc)

    Where do I start?
  2. mejinks


    Joined: Oct 28, 2002

    Posts: 4,887

    Location: Port Toilet

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