As experiment, you could maybe use mail_lua plugin to create the user directory 
on demand,

make a lua script with

function mail_user_created(user)
   -- create directory for user:home
end

See https://doc.dovecot.org/plugin-settings/mail-lua-plugin/ and 
https://wiki.dovecot.org/Design/Lua

Aki

Thanks, Aki.

I've tried it out and it looks promising.  The only issue is debugging, and the documentation isn't entirely clear to me.  I need to figure out how to output some debug data to some kind console or file.

Asai

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