https://mailarchive.ietf.org/arch/msg/asdf/2R9GMtILTjMhaiCk7mUPoPZEe_w/ reached me with Archived-At: <https://mailarchive.ietf.org/arch/msg/asdf/6QZdZAZQ2mvqHq8VTLbJLoRTZyE>

[cabo]

And the latter doesn't seem to exist.

[cabo]

Similar: message
https://mailarchive.ietf.org/arch/msg/asdf/cJr6-Q9YhgMXxqO_FMKkYGT8Jro/
arrived with header
Archived-At: https://mailarchive.ietf.org/arch/msg/asdf/X0WEL1e0ahmQluvpwCGdr-etE8c
...which again doesn't seem to exist.

[cabo]

Downloading the message from
https://mailarchive.ietf.org/arch/msg/asdf/cJr6-Q9YhgMXxqO_FMKkYGT8Jro/
yields an .eml file with this header line:

Archived-At: 
 <https://mailarchive.ietf.org/arch/msg/asdf/X0WEL1e0ahmQluvpwCGdr-etE8c>

Note the conspicuous (DOS) newline.

[cabo]

I'm currently only seeing this in ASDF.

also for older messages (May 09):
https://mailarchive.ietf.org/arch/msg/asdf/H-9qtENeHsr_OaULc7HqKcsXboY/

Archived-At: 
 <https://mailarchive.ietf.org/arch/msg/asdf/1ljYZFOzz6P6G4PqRu7Z8rmgwms>

[cabo]

... but not on May 8:

Archived-At: 
 <https://mailarchive.ietf.org/arch/msg/asdf/zrrAI_L4AXj3KXRBjOdkgeNgeek>

(correct).

[cabo]

MPLS, too:

https://mailarchive.ietf.org/arch/msg/mpls/e50u7U7jPTGVVxD8HHnGWgqJOwA/

Archived-At: 
 <https://mailarchive.ietf.org/arch/msg/mpls/o_IdAlk7DoGkti_mT0wDytlVop8>

Random observation:
The bad ones get download file names such as
"mpls_ BL3P.eml" "asdf _PAXP.eml"
while the good ones get
asdf_171520.eml rswg_40F0A1.eml

[rpcross]

This issue is caused by the archive not properly handling the leading whitespace in the Message-ID header when calculating the Archived-At header. A fix is being made.

[cabo]

Thanks! What is the release process here?

[rpcross]

The fix is included in Release v2.24.0 which is deployed now. The messages in question will now be found at the address in the Archive-At header.

[cabo]

Perfect.
Thank you!