Choosing a region

MailBlastr sends from a single, configured region. Every domain identity is created in that region, and the DNS records generated for the domain reference it.

Because the deployment is bound to one region, a region value you pass when creating a domain is accepted for compatibility but the domain is always pinned to the configured region — this guarantees the DNS records can never point at a different region than the identity. (Multi-region sending is a future enhancement.)

Where the region shows up

The region is baked into the MAIL FROM / SPF MX record. Its value is feedback-smtp.<region>.amazonses.com — for example feedback-smtp.us-east-1.amazonses.com. This routes bounce and complaint feedback to the correct region. The DKIM and DMARC records are not region-specific.

Region values

A region is a standard region identifier. Common values:

Pick the region closest to the majority of your recipients to reduce latency and improve time-to-inbox. MailBlastr is currently pinned to a single configured region, so a domain always lands there regardless of the identifier you pass.

Data residency

The region controls only where your email is routed and dispatched from — it does not control where your account data is stored. Email metadata, logs, and API records are retained in MailBlastr’s configured storage region regardless of the sending region.

Changing a domain’s region

Because the sending identity and its DNS records are tied to a region, you cannot move an existing domain to a different region in place. To switch regions:

1. Delete the current domain (`DELETE /domains/:id` or the dashboard).
2. Add the same domain again, selecting the new region.
3. Update your DNS records to match the new identity’s SPF/DKIM values, then re-verify.