[Rspamd-Users] Verifying O365 ARC headers

[Jason Atkins]

Hi

We are using rspamd to add ARC headers to a message that has already been
authenticated by O365.

When rspamd attempts to validate the O365 ARC headers in order to create
the ARC chain, it fails with a signing hash error.

I cannot see any reason why this might happen so has anyone encountered
this issue? Or managed to successfully build an ARC chain from O365 ARC
headers?