Transactional

SparkPost (MessageBird)

SparkPost (now part of Bird/MessageBird) targets enterprise-volume transactional sending. Authentication uses domain verification with a TXT-based DKIM and SPF include.

DNS records to publish

Type	Host	Value
TXT	@	`v=spf1 include:sparkpostmail.com ~all` SPF
TXT	scph<id>._domainkey	`k=rsa; p=<public key>` DKIM

Authentication setup

SPF

Add include:sparkpostmail.com to SPF.

DKIM

Publish the TXT record SparkPost generates.

DMARC

Standard rollout; SparkPost is happy with p=reject as soon as alignment is verified.

Deliverability tips

Use SparkPost's signals API to monitor inbox placement and reputation per mailbox provider.
Take a dedicated IP for any sender doing more than ~100k/day to a single provider.
Use sub-accounts to isolate customers in multi-tenant setups; they share IP pools but separate reputation accounting.

SparkPost (MessageBird) setup docs

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