shef.ac.uk

Email authentication

The basics are in place but can be hardened.

4Pass
1Warning
0Fail
1Not set

SPF

Pass

Authorizes which servers may send mail for the domain

SPF is published and within limits.

Policy: -all
DNS lookups: 6 / 10

Ends in -all (hardfail): unauthorized senders are rejected.
Uses 6 of 10 allowed DNS lookups.

v=spf1 ip4:143.167.0.0/16 ip4:95.172.88.0/22 ip4:130.88.36.5 ip4:80.93.168.194 ip4:85.92.81.226 ip4:146.177.26.90/31 ip4:146.177.26.108/31 ip4:81.17.56.1 ip4:94.23.120.168 ip4:149.56.182.220 ip4:35.242.247.107 ip4:34.107.8.58 ip4:212.227.126.128/25 ip4:82.165.159.0/26 ip4:212.227.15.0/25 ip4:212.227.17.0/27 ip4:217.72.192.64/26 ip4:74.121.48.4 ip4:31.221.91.141 ip4:212.54.136.59 ip4:31.221.72.237 ip4:35.177.177.249 ip4:35.178.89.45 ip4:50.56.130.220/30 ip4:207.97.204.96/29 ip4:146.20.14.104/30 ip4:164.177.132.168/30 ip4:35.234.108.85/32 ip4:34.90.200.156/32 ip4:35.204.47.209/32 include:_spf.google.com include:wpm.flywire.com include:spf.mailanyone.net include:spf.mandrillapp.com include:shops.shopify.com -all

DKIM

Pass

Cryptographically signs outgoing mail (best-effort selector probe)

DKIM key published for 3 known selectors.

Selectors: s1, s2, mandrill

Found a DKIM key at s1._domainkey.shef.ac.uk
Found a DKIM key at s2._domainkey.shef.ac.uk
Found a DKIM key at mandrill._domainkey.shef.ac.uk

DMARC

Pass

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

DMARC is enforced.

Policy: p=reject
Subdomains: sp=quarantine
Coverage: 100%

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

v=DMARC1; p=reject; sp=quarantine; rua=mailto:[email protected],mailto:[email protected];

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=202510182308Z;

TLS-RPT

Pass

Receives reports about TLS delivery failures

TLS reporting is configured.

Reports to: mailto:[email protected]

TLS delivery failure reports are being collected.

v=TLSRPTv1; rua=mailto:[email protected]

BIMI

Not set

Displays your verified brand logo in supporting inboxes

No BIMI record. No brand logo is published for inboxes.

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.