Jeremy Fleischman

That all said, out of an abundance of caution, I'd like to roll back until we understand what's going on: https://github.com/NixOS/infra/pull/621

I played around with [SRS](https://en.wikipedia.org/wiki/Sender_Rewriting_Scheme), and this does look pretty straightforward to do. My progress so far: 1. I noticed that nixpkgs has a pretty old version of `postsrsd`. `postsrsd`...

> Rspamd does implement ARC. Was this not also used by simple-mail server? Oops. You're totally right. I see ARC headers in emails forwarded by umbriel. Please disregard.

This issue is getting too large. I've filed https://github.com/NixOS/infra/issues/631 to investigate ARC.

I'm closing this. The new mailserver has launched (and hopefully will stay launched). We still have to clean up ImprovMX, which is tracked by https://github.com/NixOS/infra/issues/587.

> The UI does not make this obvious however, so that is definitely something that could be improved. I just tried this out, and yeah, it is confusing. Is there...

Enabling incremental adoption is a noble goal! I have a couple of thoughts on the scheme proposed here: 1. IIUC, it can't be enforced in CI. That feels unfortunate, as...

Sorry for the possibly-negative sounding wall of text. I'm skeptical that the scheme proposed here would actually be useful for the large, active projects. That may not be the goal...

> For this, the CI should pass a `--base ` so treefmt can figure out the aggregate file list of the N last commits That makes sense. We should name/document...

> I am okay with re-formatting a whole file, and I don't think we should ever get into trying to format files partially. For the record, here's evidence that large...