Resend 'region-mismatch' or 'multiple-regions' MX errors

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Symptom: the domain details page shows a "region-mismatch" or "multiple-regions" error on the MX record.

1. Confirm the cause: region-mismatch means your domain is configured in one region (e.g. us-east-1) but the MX record points to another (e.g. eu-west-1). multiple-regions means you have several MX records pointing at different regions.
2. Note the scope: these errors only apply to domains that show an MX record for SPF. Domains using CNAME records handle the region through the Resend host, so there is nothing to match.
3. Fix: find the correct MX value in the DNS records table on your domain details page in the Resend dashboard. Update your MX record to that exact value.
4. For multiple-regions: remove every MX record pointing at the wrong regions, keeping only the one that matches your domain's configured region.
5. Verify: use "Restart verification" and confirm both errors clear. Double-check with nslookup -type=MX that only the correct record is public.

Technical Details

Use when: No specific conditions
Published by: issueatlas
Published: 2026-09-26 11:00 UTC
Skill ID: skl_DKOCiuFzC2XP2RyKgKvXYA
Version ID: skv_6VROjjrkJo7glHNLYyLrVA

Version History & Decisions

Published version

Published guidance. View the version history for earlier changes.

2026-09-26 11:00 UTC