On 7/7/21 2:11 PM, Alessandro Vesely via dmarc-discuss wrote:
On Wed 07/Jul/2021 15:19:35 +0200 Roland Turner via dmarc-discuss wrote:
A mailbox provider is only one of the service providers that an
organisation might contract to send email on its behalf. Other common
examples include:
* Marketing automation (list management, sending mailouts, analytics)
* CRMs, where sellers use the CRM itself to send messages to their
customers
* Subscription management systems that send expiry reminders
* Helpdesk systems that send responses to user requests
There are dozens or hundreds of less common examples.
I see. I note that the examples you mention, except some kind of
marketing, need to receive mail, besides sending it. Indeed, being
bidirectional is a peculiar email characteristics. So, if a service
can be integrated with a mail system, then it should be able to use
its incoming as well as outgoing servers. Otherwise, it deserves
using its own subdomain.
Companies do not want to use subdomains in the sender addresses of any
of the types of email listed above. They want to be able to use
addresses in their domain, because that's what looks natural and correct
to customers. Subdomains confuse customers, and companies do not want to
confuse their customers.
Furthermore, the systems enumerated above do not typically use the
domain's corporate outgoing servers. That's the whole point. They use
their /own/ servers to send outbound emails, and that's why those emails
need to be authenticated with either SPF or DKIM for them to pass the
companies' DMARC policies.
You asked what the use case is. The use case was explained to you. It's
not useful to come back and say, "Well, I mean, if they did things
differently, then this wouldn't be an issue." They're not doing things
differently, and they don't want to do things differently. It's our job
to facilitate them being able to make their emails look the way they
want to securely. It's not our job to tell them that they can't make
their emails look the way they want to or can't employ third-party
service providers to send out emails on behalf of their domains. Either
of those is a non-starter.
Jonathan Kamens
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