Date: Sun, 28 Feb 2021 16:23:26 -0700 From: "Russell L. Carter" <rcarter@pinyon.org> To: freebsd-questions@freebsd.org Subject: Re: Somewhat OT: Mail Relay Services Message-ID: <5f52eebe-46f6-a5ec-e8e6-fde03a3a61d6@pinyon.org> In-Reply-To: <f3274507-5b85-e8f0-2a4d-aa7328209f1c@tundraware.com> References: <877d08ef-d533-69f6-4c44-f2cbbe39ba31@tundraware.com> <000001d70dff$23f1cdf0$6bd569d0$@gsicomp.on.ca> <f3274507-5b85-e8f0-2a4d-aa7328209f1c@tundraware.com>
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On 2/28/21 2:01 PM, Tim Daneliuk wrote:
> On 2/28/21 12:25 PM, matt@gsicomp.on.ca 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.
I need to study DuoCircle some more but this:
===========================================================
Multiple Delivery Ports
Need to get around an ISP restriction or firewall blocking outbound
SMTP. We accept message relays on following ports: 24, 25, 26, 587,
2525, 10025, 5252.
===========================================================
is *very* enticing. Huh. That seems like it would solve a bunch
of problems a VPS outgoing SMTP server might have. I like
the authentication options too.
I am getting excited to be able to exterminate (almost)
centurylink's ability to destroy my online presence.
Thanks everyone, this has been a very helpful discussion.
Russell
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