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Email infrastructure of sleepnumber.com

According to Live Direct Marketing's daily DNS scan (July 12, 2026), sleepnumber.com (Tranco rank #9,878) receives mail via Microsoft 365 and sends through AuthSMTP. Its DMARC policy is p=quarantine — one of the minority (47%) of DMARC publishers that actually enforce.

Mailbox provider (MX)Microsoft 365
ESPs in SPFAuthSMTP
SaaS senders in SPFKnowBe4, Qualtrics
DMARC policyp=quarantine
DMARC recordv=DMARC1; p=quarantine; rua=mailto:postmaster@sleepnumber.com,mailto:lUNUOjV0P8@dmarc.inboxmonster.com;
Tranco rank#9,878
Snapshot2026-07-12 (updated daily)

Frequently asked questions

What email provider does sleepnumber.com use?

sleepnumber.com uses Microsoft 365 for inbound mail (detected from its primary MX record) as of July 12, 2026, per Live Direct Marketing's daily Tranco top-1M scan.

What ESP does sleepnumber.com use?

sleepnumber.com authorises AuthSMTP in its SPF record as of July 12, 2026.

Does sleepnumber.com enforce DMARC?

Partially — sleepnumber.com publishes p=quarantine (as of July 12, 2026).

DNS records say who should deliver your mail — they don't say whether it lands in the inbox. Run a free inbox placement test for sleepnumber.com at Gmail, Outlook, Yandex and Mail.ru.
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