Transactional

Mailgun

Mailgun supports SMTP and HTTP API, with EU and US regions. Sending domains are authenticated with TXT-based DKIM (typically the 'mailo' or 'mta' selector) plus an SPF include and an MX record for tracking.

DNS records to publish

Type	Host	Value
TXT	@	`v=spf1 include:mailgun.org ~all` SPF (combine with existing record)
TXT	mta._domainkey	`k=rsa; p=<public key>` DKIM public key
MX	@	`mxa.mailgun.org / mxb.mailgun.org` Tracking and replies (optional)
CNAME	email	`mailgun.org` Tracking domain

Authentication setup

SPF

Add include:mailgun.org to your existing SPF record. Use the EU equivalent if sending from the EU region.

DKIM

Publish the TXT record Mailgun generates per sending domain.

DMARC

Standard rollout: p=none → quarantine → reject, with rua reporting.

Deliverability tips

Pick the region closest to your recipients (EU for European users) to comply with data residency and shorten latency.
Use Mailgun's suppression API to automatically drop bounces and complaints from your future sends.
Sign with both Mailgun's selector and your own keys if you also relay through other ESPs.

Mailgun setup docs

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