Re: [exim] ARC signing and verification

On 25/04/2020 04:20, Tom Crane via Exim-users wrote:
>> You could have done the same edit using native Exim factilities,
>> and not needing the system-filter, but no matter.
>
> Out of interest how?

in data acl :-

  warn  hosts = <the O365 outbound>
    remove_header = Subject
    add_header =    Subject: ${sg {$h_subject:} {\N[EXT] \N} {}}

--
Cheers,
Jeremy