Thomas Hochstein wrote:
Am I missing something, or wouldn't it be enough for a listowner who wishes to use that service to subscribe email@example.com to the list to achieve that goal?
Yes, although the patch contains two options. The first is the option to archive externally at mail-archive.com. The second option asks if the list admin wants to treat the external archive as primary, which sets the List-Archive header and the link on the list info page to the external archive. This is for admins that prefer a searchable archive as their primary.
(It'd be nicer if RFC 2369 stated that the List-Archive header could support multiple URLs, but it doesn't.)
The other positive for adding external archiving/mirroring as a Yes/No option is that it is helpful for list admins that don't know the services exist. The Mailman FAQ entry "How do I make the archives searchable" is a bit daunting, whereas this gives admins an easy option right in the Gui.
The option for mail-archive.com mirroring is defaulted to No.
This is a great discussion so far.