If you're ok with some other headers being stripped also, check out Mixmaster:
https://github.com/crooks/mixmaster/blob/master/debian/README.Debian - Ryan On July 22, 2018 9:12:04 AM CDT, Jean-Baptiste Thomas <cau2jeaf1ho...@laposte.net> wrote: >Looking for email service providers that anonymise outgoing email. More >specifically, accept submissions through SMTP but do not show the IP >address of the system of origin in the Received: header added by their >MTA. > >Including the originating IP address in an ad-hoc header to prevent >abuse does not bother me as long as the IP address is encrypted in such >way that only the provider can get to it. > >riseup.net hide the IP address of origin but new accounts are by >invitation only. > >protonmail.ch probably do too but they are not ideal for other reasons. > >Do you know others ? TIA.
