There are Forum Archives on FFG (Where these will likely go)

By ThenDoctor, in Dark Heresy Play By Mail/Email

They're right here:

https://community.fantasyflightgames.com/forum/167-forum-archive/

This is where the 40k stuff will end up. Seems you can still post to them as well.

Excellent, if we can still post to the archives we'll be able to continue our PbP campaign.