Since the old tz@elsie.nci.nih.gov mailing list no longer exist (in fact, there's no mx record, the name is actually a cname and the target host doesn't even seem to be accepting packets on port 25) it might be a good idea to rename the list in the code and data files where it is present.
I wrote 2 small patches (attached) that do this against tzdata2012c and tzcode2012b.
I don't see much of an urgency in doing this, but we might apply the patch whenever we have a new set of files to release.