I've just noticed this patch series doesn't appear at all in the patchew instance.
The only problem I see is that patch n.1 comes last in the mbox, but trying to import such mbox file in a local patchew instance produces no error and the patch series is correctly recognized and imported.
Probably the cover letter was not received for some other reason. The new lore-based importer would avoid these problems. Closing due to lack of reproducer.
I've just noticed this patch series doesn't appear at all in the patchew instance. The only problem I see is that patch n.1 comes last in the mbox, but trying to import such mbox file in a local patchew instance produces no error and the patch series is correctly recognized and imported.