hard and softbounces as array to external file?

[githubrsys]

Wold make sense due the possibility of location specific mailserver messages.

[PowerKiKi]

I would rather complete the existing list of regexp used to detect soft/hard bounces, so it benefit the entire community. If you have something to contribute on that topic, feel free to submit a PR (probably for Classes/BounceHandler.php)

As for exporting a list of bounces, I would strongly suggest to use a SQL RecipientList. That way you have the opportunity to create records however it fits your environnement. Or if you think it is worth it, you can implement your own RecipientList and use that instead of the built-in ones.