I'm running my own spam filter. Sometimes I see newsletters being sent from a bounce domain (eg. bounce-1355_html-xxxx-xxxx-xxxx-xxx@bounce.news.xxx.ch. Does anyone know what such domains are good for?


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    Likely because news.xxx.ch itself isn't set up to handle bounce notifications for the email sender, which is often a third-party like SES or Sendgrid or whatnot. – ceejayoz Apr 4 '20 at 20:24

the only thing the return path is good* for it receiving nondelivery and delivery reports

So, typically it's for end-to-end delivery tracking. it gives the operator of bounce.news.xxx.ch information about if the email bounces.

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