I'm used to it from mailing lists and such.
Hmm? Mails tend to have a single "Re:" with no indication of depth. All of the mailers I've ever used keep it that way, and therefor so do the mailing lists. I can hardly find any "Re: Re:" mails in my mboxes and none with "Re: Re: Re:" or more.

Makeshifts last the longest.

In reply to Re^2: Automatic Re-ing with numbers by Aristotle
in thread Automatic Re-ing with numbers by liz

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