[stevekemp]

I think the point where Lua gets interesting is when it can be invoked when a new message is received, or you can iterate over message heads & the message-list(s) and process them automatically.

For example you might have a folder of "backup results", you'd want to mark all that have a subject of "Backup OK" as read, and flag the ones that have a subject of "Backup FAILED" as "important". Those are the kind of tasks I automate with my lua-based mail-client.

You can get more interesting and say "Keep only the most recent 100 messages in folder XXX" which applies whenever you either launch the client, or open a given folder too.