Wez Furlong a316f7a9c4 shaping.lua: use new tsa endpoint, falling back to old
Adjust our subscription to try the new generic event endpoint,
and if that 404's, fall back to the suspension endpoint.

This commit doesn't add support for the new bounce records,
it is focused on ensuring that suspension information is
returned correctly for both old and new endpoints.

The integration tests will use the new endpoint only
because it is too much of a faff to run them against
a legacy tsa-daemon (since we can only build and run
the current one here).

I tested this commit in phases though:

* Deliberately used the wrong URL for the new endpoint to
  trigger the 404 logic case and handle fallback
* Inserted an error in the fallback case to ensure that
  the fallback wasn't happening once the new endpoint URL
  was set to the correct one.

So this should enable folks to upgrade either TSA or kumod
in either order across their deployment, without the "mismatch"
in TSA and kumod versions harming their traffic.

refs: https://github.com/KumoCorp/kumomta/issues/272
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KumoMTA

KumoMTA is an open-source Message Transfer Agent (MTA) designed for high-performance outbound email functionality, similar to commercial enterprise MTAs such as Momentum, PowerMTA, and Halon.

The KumoMTA project was founded by a group of email industry veterans with decades of experience building and managing high-performance On-Prem MTAs and is supported by a community of some of the largest senders in the world.

Because it is designed for high-performance sending environments, KumoMTA is for experienced email operations professionals who are accustomed to high-performance sending environments and familiar with DevOps practices.

Learn more in our FAQ and at https://kumomta.com/.

Documentation

You can learn more about KumoMTA from the Documentation.

Community

Real-time discussion is available on Our Discord.

Developers

If you are interested in contributing/extending KumoMTA, take a look at DEVELOPERS.md. The #devel channel on Our Discord is for contributors to discuss KumoMTA development.

Reporting Bugs

See How to Report Bugs.

Getting Help

See How to Get Help. For paid support see https://kumomta.com/support.

Getting Updates

You can subscribe to updates at https://kumomta.com/subscribe, we send updates periodically and will never sell nor share your information.

Talk to Us

We're available to talk about the project, book us at https://cal.com/team/kumomta/talk-with-kumomta.

S
Description
The first Open-Source high-performance MTA developed from the ground-up for high-volume email sending environments.
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