X-Mailer: ZuckMail [version 1.00]
I mean is this custom-made smtp mailer? or X-Mailer header with custom value like X-Mailer:myMailer ?
You can set the X-Mailer
header to anything you want so it was probably the script developers pet name. In this case I would guess it is an email from Facebook with Zuck being short for Mark Zuckerberg.
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