Possible to enable other characters for subaddressing (besides +) on a domain level?

I see that over time both dash and underscore have been taken away as subaddressing options.

However, plus addresses are (bad) not accepted by some companies or (worse) fail silently/cause strange issues at a rare few.

Is it possible to re-enable dash (or underscore, or something) at an account, domain, or mailbox level to get this functionality back?

Sadly that won’t be an option in the current product iteration. It may be something we can consider in a future iteration, but if I were to estimate the path to that stage I would say 5-10 years.

Ah, that’s unfortunate. Thanks for the quick reply.