Re: autoresponses and localparts

> This sort of concerns vacation, but it's a little more general really. 
Indeed! I never thought about it and RFC 3834 appears to be silent about
the topic.

> 1. Case-fold both localparts before storing the 
> (sender,handle,recipient,expiry) tuple.
> 2. Case-fold only the sender's localpart.
> 3. Case-fold neither (just in case :from refers to a non-local 
> case-sensitive localpart).
Exim uses 3 and I like it that way.

Michael