sparkpostmail.com

Observed 2026-07-15T16:40:49.566Z (1d ago). Every field below was attested with an Ed25519 signature at scan time.

Up right now

Runs onCloudflare

Email bySparkPost

Registered withMarkMonitor Inc.

Also usesGoogle Search Console

1 subdomain · tranco_20k

Every line above is a signed observation. Check the math at the bottom of the page.

INFRASTRUCTURE MAPwhat sparkpostmail.com actually stands on - every host below is a signed observation

sparkpostmail.com

A / AAAA

18.155.192.4318.155.192.6118.155.192.9618.155.192.46

Cloudflareserves the site

ns-1855.awsdns-39.co.ukns-775.awsdns-32.netns-1361.awsdns-42.orgns-304.awsdns-38.com

awsdns-39.co.uk + awsdns-32.net + moreanswers its DNS

smtp.sparkpostmail.com

SparkPostreceives its email

HTTPS probe

redirect Redirecting (3xx) 301 → https://bird.com/api/email?sp=true

HTTP status301

Servercloudflare

TLS protocolHTTP/3

TLS issuernot observed

Behind Cloudflareyes

Response time53 ms

DNS resolutionNOERROR

Redirect chain

https://bird.com/api/email?sp=true

Every field above is part of the same signed observation as the records below. Blank means not observed, never "none".

DNS Records

A 4

18.155.192.43
18.155.192.61
18.155.192.96
18.155.192.46

MX 1

5smtp.sparkpostmail.com

TXT 5

v=spf1 exists:%{i}._spf.sparkpostmail.com ~all
yahoo-verification-key=3FbuT+COxdPHeqY8GDS1MS5lZ+Y4R0w0MCU5RmkGdic=
202309142210142gjgf5fwokyagxwm41zux4qqpsky7k3ybnkqsbic1mlkhki0he
google-site-verification=yCMV3z3BhBaINi0V033HnfTi9xkQjpIZ4DM4ywSlwUs
v=DMARC1; p=reject; rua=mailto:dmarc-reports@sparkpost.com,mailto:dmarc_agg@250ok.com; ruf=mailto:dmarc_fr@250ok.com

NS 4

ns-1855.awsdns-39.co.uk
ns-775.awsdns-32.net
ns-1361.awsdns-42.org
ns-304.awsdns-38.com

SOA 1

ns-1855.awsdns-39.co.uk awsdns-hostmaster.amazon.com

TLS Certificates (0)

None.

Subdomains (1)

smtp.sparkpostmail.com

The proof

Signed at scan time. Check the math yourself. Every line above is part of one signed observation. Re-hash it and check the Ed25519 signature in your own browser; nothing leaves your machine.

Verify this receipt

Put the receipt on your own site. A live badge showing what DomainDrift observes and signs for sparkpostmail.com. It updates itself. It attests a signed observation - not that the site is safe.

<a href="https://domaindrift.io/t/sparkpostmail.com">
  <img src="https://domaindrift.io/badge/sparkpostmail.com.svg"
       width="300" height="64" alt="DomainDrift signed observations for sparkpostmail.com">
</a>

Ed25519 Receipt

Receipt ID: c5834f91-edb4-47f0-92a0-e408f2aec530
Output Hash: 9637c50b0e163adf7c740966e3b13ae475da70462ce337c5e96a7f00ce863df4
Signature: ed25519:7f46e8686cdbcf4696e2e162ecf4709afbf7f3f93509c90ddb09e7f710d1a5aa58483e4be615768539d8c2a27d682cf5f2d15289f1addec788aa8435f7250b0f
Public Key: ed25519:d610d74ef18f683e5beb859d241d5e67dff0c122e8928b06bec1c2476f4ba27b
Parent: (genesis)
Plane: fast

Verify this in your browser

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