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Why is email clients Blocking Picture Download?

 
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Jesper Frier
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Joined: 09 Sep 2006
Posts: 1771
Location: Stoevring, Denmark

Posted: Tue Jul 24, 2007 10:36 am    Post subject: Why is email clients Blocking Picture Download? Reply with quote

Why is email clients Blocking Picture Download?

Symptom
    By default, Outlook 2003 and 2007 blocks the automated retrieval of web-based images in email (linked images). This is true whether you view emails in the preview pane or open them fully. You will see the text of the email and any HTML formatting, but not the images.
    Exclamation Note that blocking does not affect images that are embedded in the email (in-line images).

Solutions
  1. Remove image blocking entirely:

    • From the Tools menu in Outlook, choose Options
    • Select the Security tab
    • Click the “Change Automatic Download Settings…” button
    • Clear the check box

  2. Add senders or domains to your white list:

    • Right click on one of the blocked images
    • Select either Add Sender or Add Domain as desired

How it came about
    By default, Outlook blocks all HTML content that is referenced by an external location as an attempt to mitigate spam. Many spam senders include an image URL in their e-mail messages. The image URL notifies the spam sender's Web server when you open or preview the message. This kind of image URL is also known as a Web beacon. The following is a sample Web beacon:

    Code:
    <img src=http://myserver/cgi-bin/program?e=your-e-mail-address-here>


    If you preview or open an e-mail message that contains this kind of an image reference, you may make your computer a target for more spam.

The effect
    Leaving the default setting as is will block all HTML images in all email you receive, spam or legitimate. Thus, if you receive an email newsletter, e-catalog, e-alert, email announcement or any other email that contains web-based graphics, the readability of that message will be diminished unless you take action. The default setting in Outlook 2003 can render some emails completely unreadable.

The future
    We live in an HTML world. Most surveys show that over 95% of businesses accept HTML email. The default compose mode for Outlook is HTML. The vast majority of companies, including Microsoft, continue to send HTML-based newsletters. As for Anti-spam strategies, major companies including Microsoft, Yahoo, Google, and several standards bodies have shifted toward technologies that verify the authenticity of the sender, rather than restricting the content of the email. The bottom line is that, given its incredibly powerful messaging, user interaction and effectiveness, HTML email is here to stay.
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