dovecot - Apr 2010 - order of variable modifiers

I'd like to have a variable substitute take the domain name part, lower case
it, MD5 it, and take a 2-character substring of that.  Would that be like
%2MLd ?  The documentation on the H hash modifier described reversing with
R, but expresses it at %3RHu which seems to me like it would be reversing
the hash result rather than the user string.

I'm undecided about MD5 vs. hash, and could go either way.  But I was
thinking:

mail_location = /data/mail/%2MLd/%Ld/%2MLn/%Ln

On Fri, 2010-04-23 at 09:37 -0400, Phil Howard wrote:
> I'd like to have a variable substitute take the domain name part, lower
case
> it, MD5 it, and take a 2-character substring of that.  Would that be like
> %2MLd ?
It's left to right, so "%2LMd". The substring is a special case,
it's
always done to the finalized string.
> The documentation on the H hash modifier described reversing with
> R, but expresses it at %3RHu which seems to me like it would be reversing
> the hash result rather than the user string.
Maybe the text is a bit confusing. It does first reverse the string and
then take a hash of it. I guess the main problem here is that the %H
hash function is pretty bad, and doesn't give as good output values if
the end of the string is always the same.