[MlMt] one pixel tracker images

Bill Cole mmlist-20120120 at billmail.scconsult.com
Thu Mar 18 22:58:03 EDT 2021

On 18 Mar 2021, at 11:31, Steven M. Bellovin wrote:

> It can't tell if it's a 1x1 image until after it's downloaded, by 
> which
> time the damage has been done.

It can tell if the IMG tag includes width & height attributes, which it 
almost always will in HTML mail, as it is critical for doing partial 
rendering if the image isn't available.

Bill Cole
bill at scconsult.com or billcole at apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire

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