Somewhat OT: Mail Relay Services

Russell L. Carter rcarter at
Mon Mar 1 00:37:00 UTC 2021

On 2/28/21 5:19 PM, Tim Daneliuk via freebsd-questions wrote:
> On 2/28/21 3:01 PM, Tim Daneliuk wrote:
>> 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.
> The only other thing I have found that I do not like is that DuoCircle
> appears to  keep a copy of every email sent including the body content
> in their logs.

Oh dear, there's always a catch.  This wouldn't be an issue if encrypted
body content was a thing but all the time that I had active pgp keys and
some savvy correspondents I got, over a few years, maybe a half dozen
encrypted bodies.

I am inclined to think of it this way:  can't trust TLS relays at all,
and they're just another relay.  At least I can send mail.  Am I being


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