I see that there is a 3rd party plugin for sparkpost:
There is a PR, which claims to fix one click unsubscribe, but isn’t merged yet.
Are there any other SparkPost Plugins?
Do you successfully use Sparkpost in Mautic5 with API and working unscubsribe header as well as bounce managment?
I wouldn’t recommend it. It will send emails faster but it would uncover the bug where the one-click unsubscribe header is broken for batch email sends. You don’t want that I’m sure.
This is waiting for another PR that this fix depends on that the team from Webmecanik are working on.
Not using the patch. The plugin is fine. It will just send 1 email at a time which avoids the bug with one-click unsubscribe. And it will handle bounces for you.
Once the patch is merged and released it will start to send 2000 times faster which is a nice bonus but nothing preventing you to use the plugin right now.