Switchover MX records from ImprovMX to umbriel.nixos.org

[jfly]

Switchover scheduled for Saturday April 5th at 4PM UTC.

Here's the rollout plan:

• (re) confirm that mailserver alerting is working
• In case anything changed: re-sync mailing lists and SMTP sending accounts from ImprovMX to NixOS/infra: Update mailing-lists with latest mailing lists and SMTP sending accounts in ImprovMX #586
• Switchover the MX records from ImprovMX to umbriel.nixos.org: Switch our MX record(s) from ImprovMX to umbriel.nixos.org #588
• After the MX record change has propagated everywhere (check with https://www.whatsmydns.net/), verify that email forwards still work. If not, switch the MX records back.
• Cleanup:
  • Update NixOS/org: Point to the single source of truth for emails org#97
  • Remove test addresses from mailing-lists.nix: Remove testing mail accounts #611
  • Shut down our ImprovMX account before the next billing cycle which starts on 2025-04-15.

[Erethon]

I think we should also make sure that any existing SMTP accounts in ImprovMX either aren't used or if they're used that we have a way to quickly recreate them in umbriel. The Nix@NGI team is currently using one SMTP account, I don't know if there are more.

PS. Is that ETA about early March correct?

[jfly]

I think we should also make sure that any existing SMTP accounts in ImprovMX either aren't used or if they're used that we have a way to quickly recreate them in umbriel

I've updated #586 accordingly.

The Nix@NGI team is currently using one SMTP account, I don't know if there are more.

I've asked for a dump from ImprovMX (I don't personally have access). The dump won't include SMTP passwords, so I'll be pinging people to encrypt and commit a password to NixOS/infra.

Speaking of... @Erethon, could I ask you to send in a PR adding the Nix@NGI SMTP account to this repo? Instructions are on https://github.com/NixOS/infra/tree/3a2651796837bce93aa7d4866ead578a3a9ac035/non-critical-infra/modules/mailserver#mailing-lists.

[nixos-discourse]

This issue has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/nixos-org-email-infrastructure-has-been-migrated-from-improvemx-to-our-own-emailserver/62704/1

[SigmaSquadron]

Hey, the [email protected] alias seems to have been removed. The Xen Team uses it to recieve embargoed security advisories from the Xen Project.

[mweinelt]

Looks like only the first page on improvmx was synced.

[mweinelt]

#612

[Mic92]

I think I missed pagination in the API.