Somewhat OT: Mail Relay Services

Tim Daneliuk tundra at
Sun Feb 28 21:01:59 UTC 2021

On 2/28/21 12:25 PM, matt at wrote:
> Like anything to do with email, it's not entirely as simple as it sounds.
> DuoCircle requires per-domain setup via their UI ("permitted senders"), plus
> you need to set up SPF and DKIM keys for each domain.
> This was a hard slog for 100+ domains but has been entirely worth the
> initial effort and ongoing cost to avoid mail delivery complaints from
> customers that are entirely beyond my control.

Thanks Matt (and everynone else who had suggestions) -

This seems to work just fine, as evidenced by the headers in this
very email.

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