[hampus]

If your email service supports Sieve scripts (for example, Fastmail or Proton Mail), you can use this filter [1] that I made. It's very aggressive and will block all emails that originate from Zendesk, so you'll need to disable it whenever you're actually expecting mail from Zendesk.

[1]: https://gist.github.com/hampuskraft/780c8fbcc4042689153533ef...

[lynndotpy]

For those on Fastmail, here's a link to get to that setting directly: https://app.fastmail.com/settings/filters/sieve

[DANmode]

Who knows when they’re emailing a mailbox behind Zendesk?

[hampus]

Zendesk conversations tend to follow a standard template that's easy to recognise. They also often mention Zendesk in the footer ("Delivered by Zendesk").

Either way, someone shared a much more minimal version [1] on my gist, which should be safe to use as long as you're not signing up for a Zendesk site. Most of the recent spam emails have been about Zendesk sign-ups specifically.

I just didn't want to keep maintaining this script if they find some other way to exploit Zendesk in the future, hence my nuclear approach.

[1]: https://gist.github.com/hampuskraft/780c8fbcc4042689153533ef...