[Rspamd-Users] ^L causing DKIM validation errors with opensmtpd+rspamd

[Jason A. Donenfeld]

I figure I should add the rspamd list to this thread.

-- Original Message --

Hi,

Using a fairly typical OpenSMTPD+rspamd setup, I'm finding that emails
sent that have the ^L escape in them come out with an invalid DKIM
signature. Something basic like:

  filter rspamd proc-exec "filter-rspamd"
  listen on ... filter rspamd

Everything else is otherwise pretty default and vanilla.

Below is base64 of an mbox email that causes the problem when sent out
using `git send-email` which pipes it to msmtp which submits it to
opensmtpd+rspamd where it gets corrupted.

Anyone see something like this before?

Regards,
Jason

base64 -d > naughty-email.mbx
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