sainsburys.co.uk

Email authentication

The basics are in place but can be hardened.

3Pass
2Warning
0Fail
1Not set

SPF

Warning

Authorizes which servers may send mail for the domain

SPF is published but could be tightened.

Policy: ~all
DNS lookups: 9 / 10

Ends in ~all (softfail): unauthorized senders are marked, not rejected.
Uses 9 of 10 allowed DNS lookups. Close to the limit.

v=spf1 include:spf-0059c002.pphosted.com include:spf-0059c003.pphosted.com include:mail.zendesk.com include:spf_c.oraclecloud.com include:spf-000ff402.pphosted.com a:smtp.info-exchange.com include:_spf.psm.knowbe4.com ~all

DKIM

Pass

Cryptographically signs outgoing mail (best-effort selector probe)

DKIM key published for 4 known selectors.

Selectors: s1, s2, k1, mandrill

Found a DKIM key at s1._domainkey.sainsburys.co.uk
Found a DKIM key at s2._domainkey.sainsburys.co.uk
Found a DKIM key at k1._domainkey.sainsburys.co.uk
Found a DKIM key at mandrill._domainkey.sainsburys.co.uk

DMARC

Pass

Tells receivers what to do with mail that fails SPF and DKIM

DMARC is enforced.

Policy: p=reject
Coverage: 100%

Policy p=reject: failing mail is rejected outright.
Aggregate reports (rua) are configured.

v=DMARC1; p=reject; rua=mailto:[email protected]; ruf=mailto:[email protected]; aspf=r; fo=1

MTA-STS

Warning

Enforces TLS for inbound mail and prevents downgrade attacks

MTA-STS is published but not enforcing.

The DNS record exists but the policy file could not be read.

v=STSv1; id=2021010100

TLS-RPT

Not set

Receives reports about TLS delivery failures

No TLS-RPT record. You get no reports about failed TLS delivery.

BIMI

Pass

Displays your verified brand logo in supporting inboxes

BIMI is published.

Logo: https://vmc.digicert.eu/0074f68e-d8f5-4a60-b394-c0b62bf61d5a.svg
VMC: https://vmc.digicert.eu/0074f68e-d8f5-4a60-b394-c0b62bf61d5a.pem

A logo (l=) is published.
A Verified Mark Certificate (a=) is referenced.

v=BIMI1;l=https://vmc.digicert.eu/0074f68e-d8f5-4a60-b394-c0b62bf61d5a.svg;a=https://vmc.digicert.eu/0074f68e-d8f5-4a60-b394-c0b62bf61d5a.pem

Checks query live DNS over Cloudflare and the public MTA-STS policy endpoint. DKIM selectors cannot be listed from DNS, so DKIM detection probes common provider selectors only.