On Thu, 2018-01-04 at 10:03 -0800, Linus Torvalds wrote:
> 
> but then you used infradead as a mailer, so it has the DKIM signature
> from infradead, not from Amazon.co.uk.
> 
> The DKIM signature does pass for infradead, but amazon dmarc - quite
> reasonably - wants the from to match.

Apologies. In the struggle to get it sent without the corporate mail
setup adding an HTML disclaimer to it, I forgot about DKIM. I'll make
sure I get that right next time.