# AFC-CSO-TFG — Trust @fedramp.gov and @gsa.gov

> FedRAMP Consolidated Rules for 2026 v2026.07.14.01 · updated 2026-07-14
> Canonical page: /requirement/afc-cso-tfg

Addressing FedRAMP Communication (`AFC`) · group all · subset CSO
Force: MUST

## Statement

Providers MUST treat any email originating from an @fedramp.gov or @gsa.gov email address as if it was sent from FedRAMP by default; if such a message is confirmed to originate from someone other than FedRAMP then the FedRAMP Security Inbox rules no longer apply.

## Who it binds

- Providers

## Certification classes

_Applies regardless of certification class._

## Which certifications it binds

Certification type: 20x, Rev5
Path: Program, Agency

## Machine-readable form

_This requirement names no JSON schema. FRC-CSO-JSN binds a provider to a schema only where a rule contains one._

## Artifacts

- {"text":"Configuration settings for FSI mailbox","scope":"all","class":null,"source":"requirement"}
- {"text":"Automated validation to check FSI mailbox configuration","scope":"all","class":null,"source":"requirement"}

## Timeframes

_This requirement states no deadline._

## Notifications

_This requirement demands no notification._