no more subject prefix for texhax mailing list

[Karl Berry]

Hi - I've removed the "[texhax]" prefix on Subject lines from this
mailing list (texhax)'s messages. It is my hope that this will reduce
the ever-increasing flood of dmarc failures.

This was first noticed with Yahoo, long ago, which did not matter much,
then with icloud etc., which was worse, and now I see it from lots of
other email providers, government institutions, large companies, etc.
It is hard to discern exactly when the errors happen, but they are
increasingly common.

The List-Id: header identifies the mailing list for mailing list
messages. I know it is less convenient, but that is the Internet today.

I'm going to need to do this on other tug lists too, eventually all of
them, I expect.

I am discouraged by the need to kowtow to dmarc's draconian breakage of
standard mailing list usage, but there is no viable alternative. -k