Domain Intelligence
Last Updated:
Sheffield.ac.uk
Safe to Send
Sheffield.ac.uk is operated by University of Sheffield. The domain runs 5 mail exchanges and SMTP is responsive, with all three authentication standards in force.
Safe to Send
RISK
11
/100
Low
Verify Mailbox
Verify @sheffield.ac.uk emails
Live SMTP handshake against sheffield.ac.uk mail servers. No email is sent. 10 free per day, no signup.
Trusted by 400,000+ senders
4.9/5
From 8,500+ verified reviews
Disposable detection is the strongest I've tested. We were drowning in fake signups before integration. Fraudulent account creation dropped roughly 80% in the first 10 days. Risk score on the lookup pages helps our analysts triage faster too. Elena Reyes · Trust & Safety, Fintech
SOC 2 Type II
GDPR
CCPA
99.7% Accuracy
Disposable
No
Persistent addresses, not throwaway
SMTP Live
Yes
Mail server responds to SMTP handshake
MX Records
5
Mail exchangers
Mail Exchange (MX) Records for sheffield.ac.uk Mail Exchange records. They tell other mail servers which hosts are responsible for receiving email at this domain, in priority order. Lower priority numbers are tried first.
#1
aspmx.l.google.com 142.250.31.26
Reachable
#5
alt2.aspmx.l.google.com 172.253.116.27
Reachable
#5
alt1.aspmx.l.google.com 108.177.123.26
Reachable
#10
alt3.aspmx.l.google.com 192.178.223.26
Reachable
#10
alt4.aspmx.l.google.com 173.194.76.27
Reachable
SMTP Handshake
Simple Mail Transfer Protocol. We open a live SMTP connection to the primary MX and read the greeting banner. A response confirms the mail server is alive and accepting connections.
Responsive
BANNER220 mx.google.com ESMTP 6a1803df08f44-8bf3a0596fcsi107626946d6.91 - gsmtp
Primary mail server accepted SMTP connection and returned a banner during the live audit.
sheffield.ac.uk Email Authentication SPF · DKIM · DMARC
SPF
Sender Policy Framework. A DNS record listing which servers are allowed to send mail for this domain. Receivers reject or flag mail from unauthorized servers.
Pass
TXTv=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
Authorized senders are defined and pass SPF policy.
DKIM
DomainKeys Identified Mail. The sending server cryptographically signs outbound mail with a private key, and receivers verify the signature using a public key in DNS.
Pass
SELECTORDetected via standard selectors
A DKIM signature was detected. Outbound mail from this domain can be cryptographically verified.
DMARC
Domain-based Message Authentication, Reporting & Conformance. Tells receivers what to do when SPF or DKIM checks fail: none, quarantine, or reject.
Reject
TXTv=DMARC1; p=reject; sp=quarantine; rua=mailto:dmarc-rua@dmarc.service.gov.uk,mailto:re+fgkd33bleer@dmarc.postmarkapp.com;
Strict policy. Receivers are instructed to reject any mail that fails SPF or DKIM. The strongest available setting.
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More Email Verification Tools
Free single-address checks, bulk uploads, and APIs for plugging email verification into your own product.
Common Questions About sheffield.ac.uk
Is sheffield.ac.uk a disposable or temporary email provider?
No. sheffield.ac.uk is not a disposable email provider. It is classified as Education Email operated by University of Sheffield and addresses on sheffield.ac.uk are persistent rather than throwaway. Mail sent to a valid sheffield.ac.uk mailbox reaches a real recipient.
How do I verify if a sheffield.ac.uk email address is valid?
The fastest way to verify a sheffield.ac.uk email address is to use our free email checker. Enter any @sheffield.ac.uk mailbox at the top of this page and our system performs a real-time SMTP handshake against sheffield.ac.uk's mail servers, confirming whether the mailbox exists, is reachable, and is safe to send to. No email is ever delivered during the check.
Can I check if a sheffield.ac.uk email exists without sending a message?
Yes. Our real-time email verification API connects directly to sheffield.ac.uk's mail server, opens an SMTP session, and queries the mailbox using the RCPT TO command without ever transmitting an actual email. The server's response confirms whether the sheffield.ac.uk mailbox is valid, full, or non-existent. The recipient never receives anything and never sees the check.
What are the MX records for sheffield.ac.uk?
sheffield.ac.uk currently publishes 5 mail exchange (MX) records. The primary MX is aspmx.l.google.com, which is the first server contacted when other mail systems try to deliver email to a sheffield.ac.uk address. The full list with priorities and IP addresses is in the MX Records panel above. MX records tell sending servers where to route email for sheffield.ac.uk.
Does sheffield.ac.uk use SPF, DKIM, and DMARC email authentication?
sheffield.ac.uk enforces all three email authentication standards: SPF, DKIM, and DMARC (policy: reject). This is the gold-standard configuration. It means receivers can verify that mail claiming to come from @sheffield.ac.uk is genuine, and sheffield.ac.uk's DMARC policy of 'reject' instructs receivers how to handle messages that fail those checks.
Why do emails to sheffield.ac.uk bounce or get blocked?
Bounces from sheffield.ac.uk usually fall into three buckets: the mailbox doesn't exist (5xx user unknown), the inbox is full, or your sending domain isn't authenticated to sheffield.ac.uk's satisfaction. The fastest fix is to run each address through a free email verifier before you send, and to make sure your own SPF, DKIM, and DMARC are configured correctly so sheffield.ac.uk's receivers trust you.
How can I verify a large list of sheffield.ac.uk email addresses?
Our bulk email verifier accepts CSV or TXT uploads with thousands or millions of sheffield.ac.uk addresses (or any mix of domains). Every address goes through 30+ checks including SMTP existence, sheffield.ac.uk catch-all detection, role-account detection, and disposable-domain matching. Results typically come back within minutes and previously-failed addresses on your blacklist are reprocessed for free. For continuous high-volume needs, see our unlimited email verification API.
Is it safe to accept signups from sheffield.ac.uk email addresses?
Yes, with normal hygiene. sheffield.ac.uk is a legitimate email service and signups from @sheffield.ac.uk behave like any other real user. Pipe each address through a real-time email verifier API at the moment of signup to catch typos and dead mailboxes, but there is no need to block sheffield.ac.uk by default.
What email format does sheffield.ac.uk use for usernames?
Most sheffield.ac.uk mailboxes follow common patterns like first.last@sheffield.ac.uk, firstinitiallast@sheffield.ac.uk, or first@sheffield.ac.uk, but the actual local-part rules depend on University of Sheffield. The only reliable way to confirm whether a specific @sheffield.ac.uk address exists is to run it through a free email verification tool. Guessing patterns will produce a high bounce rate and damage your sender reputation.
How is the sheffield.ac.uk risk score calculated?
The 0-to-100 risk score for sheffield.ac.uk combines disposable-domain classification, mail-server reachability, MX record presence and depth, SPF / DKIM / DMARC enforcement, DMARC policy strength, SMTP banner response, and domain age. Lower scores mean safer to send to. Disposable domains are pinned at the high end of the scale. The sheffield.ac.uk score is recomputed on every audit so it always reflects the live state of the domain.
Is sheffield.ac.uk a valid education email domain?
Yes, sheffield.ac.uk is a valid educational institution email domain operated by University of Sheffield. It is used by students, faculty, and staff for academic correspondence.
Is sheffield.ac.uk a disposable or temporary email provider?
No, sheffield.ac.uk is not a disposable or temporary email provider. It is an institutional email domain. However, student email addresses may be deactivated after graduation depending on the institution's policy.
What mail server does sheffield.ac.uk use?
sheffield.ac.uk uses mail servers managed by or on behalf of University of Sheffield. Many universities use Microsoft 365 or Google Workspace for their email infrastructure. Check the MX records section above for details.
Can I send marketing emails to sheffield.ac.uk addresses?
You can send emails to sheffield.ac.uk addresses with proper consent. Be aware that educational institutions often employ strict spam filtering, and student addresses may become inactive after graduation. Regular list hygiene is recommended.
How do I verify an email address at sheffield.ac.uk?
Use BulkEmailChecker to verify sheffield.ac.uk addresses. Educational domains may use catch-all configurations or have specific SMTP behaviors. Our tool handles these institution-specific configurations automatically.