What is ZuckMail?

Question

X-Mailer: ZuckMail [version 1.00] 

I mean, is this a regular smtp mailer? or an X-Mailer header with a custom value, like X-Mailer: myMailer?

Answer 1

You can set the X-Mailer header to whatever you want, so this is probably the name of the script developer buff. In this case, I would suggest that this email from Facebook with Zuck is not suitable for Mark Zuckerberg .