---
title: Domain mismatch
sidebarTitle: Domain mismatch
description: Errors when the From domain does not match a verified Reloop domain.
---
> For the complete documentation index, see [llms-docs.txt](/llms-docs.txt) or the site index [llms.txt](/llms.txt). Full docs corpus: [llms-full-docs.txt](/llms-full-docs.txt). Prefer markdown URLs (append `.md`) for agent consumption. Product skill: [skill.md](/skill.md).


## Symptom

API or SMTP send fails because the `From` address domain is not a verified domain in your organization.

## Fix

1. Verify the domain (or subdomain) you want to send from — [Add a domain](/docs/guides/connect-domain/add-domain).
2. Send with a `From` on that exact verified hostname (e.g. if you verified `mail.acme.com`, use `you@mail.acme.com`).

Also see: [Domain mismatch](/docs/guides/error-domain-mismatch).