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the actual base64 email itself is an HTML document, with a bunch of filler text about metal magnets!

> Hi there, A magnetic domain is a region within a magnetic material in which the magnetization is in a uniform direction. This means that the individual magnetic moments of the atoms are aligned with one another and they point in the same direction [...]

they sign off the email with a zero-width space set to "font-size: 0" for some reason

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The text is from https://en.wikipedia.org/wiki/Magnetic_domain that uses a CC BY-SA 4.0. I hope they remembered to add the atribution as requested :)

Also, the magnet text is not visible:

style="position: absolute; left: -9999px; top:-9999px;display: none"

maybe they try to warm up those emails to use them for other "campaigns" later on...

The text is added to get around bayesian filters. The spammer doesn't want the text to be displayed to the end user though typically.

A smart bayesian filter would catch email with invisible text. Legitimate email shouldn't have any, but I have seen it more than once in spam

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