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Email infrastructure of core.ac.uk

According to Live Direct Marketing's daily DNS scan (July 13, 2026), core.ac.uk (Tranco rank #6,244) receives mail via Microsoft 365 and sends through MailerSend. Its DMARC policy is p=quarantine — one of the minority (47%) of DMARC publishers that actually enforce.

Mailbox provider (MX)Microsoft 365
ESPs in SPFMailerSend
SaaS senders in SPFnone detected
DMARC policyp=quarantine
DMARC recordv=DMARC1;p=quarantine;sp=quarantine;pct=100;rua=mailto:dmarc@open.ac.uk,mailto:e1pWdXALyij@dmarc-rua.mailcheck.service.ncsc.gov.uk
Tranco rank#6,244
Snapshot2026-07-13 (updated daily)

Frequently asked questions

What email provider does core.ac.uk use?

core.ac.uk uses Microsoft 365 for inbound mail (detected from its primary MX record) as of July 13, 2026, per Live Direct Marketing's daily Tranco top-1M scan.

What ESP does core.ac.uk use?

core.ac.uk authorises MailerSend in its SPF record as of July 13, 2026.

Does core.ac.uk enforce DMARC?

Partially — core.ac.uk publishes p=quarantine (as of July 13, 2026).

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