[dkim-milter-discuss] RSA_verify: bad signature

[Simon B. <f3...@go...>]

Hi, I am running postfix with dkim-milter. I sign out-going mail and
verify incoming. When my mail server receives from google or yahoo,
all seems to be fine, I get:
--
dkim-filter: DKIM verification successful
--
But mail from 'bluebottle' email gives me this error:
--
dkim-filter: DKIM verification successful
dkim-filter: s=fe0 d=bluebottle[dot]com SSL error:04077068:rsa
routines:RSA_verify:bad signature
--

Could someone help me understand what the error means and if it is
something wrong with my server?

Thank you