Is your feature request related to a problem? Please describe.
Currently, and since at least 2017, K9 has been unable to parse multiple emails out of a comma-delimited list. This was added to a feature request list in 2018, but no action appears to have been taken to facilitate.

Describe the solution you'd like
Simply put, I need to be able to either Reply-to-All when it's a BCC list, OR Copy/Paste/Auto-Parse a batch of comma-delimited email addresses.

Describe alternatives you've considered
The only alternative is to copy the group into a notepad, then copy/paste them one-by-one back into K9. This isn't a solution, and unfortunately will result in necessitating the move to another email client after several years of being a big fan of this one.