Domain Intelligence
Last Updated:
Desu.edu
Safe to Send
Desu.edu is operated by Delaware State University. The domain runs 1 mail exchange and SMTP is responsive, with all three authentication standards in force.
Safe to Send
RISK
15
/100
Low
Verify Mailbox
Verify @desu.edu emails
Live SMTP handshake against desu.edu 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
Switched after a billing dispute with NeverBounce. Same SMTP results on a 5k test sample. The MX, SPF, DKIM lookup tools are a hidden value-add for debugging client deliverability complaints. James Wexler · Growth Engineer
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
1
Mail exchangers
Mail Exchange (MX) Records for desu.edu 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
desu-edu.mail.protection.outlook.com 52.101.194.12
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 SJ1PEPF00002321.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Wed, 13 May 2026 21:10:12 +0000 [08DEADB45534DC27]
Primary mail server accepted SMTP connection and returned a banner during the live audit.
desu.edu 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 ip4:198.61.244.158 ip4:52.22.249.69 ip4:205.139.104.0/22 ip4:216.235.195.0/24 ip4:52.55.21.93 ip4:34.197.131.165 ip4:176.31.145.254 ip4:198.187.196.100 ip4:199.255.192.0/22 ip4:199.127.232.0/22 ip4:69.169.224.0/20 ip4:23.249.208.0/20 ip4:23.251.224.0/19 ip4:76.223.176.0/20 ip4:54.240.0.0/17 ip4:76.223.128.0/19 ip4:216.221.160.0/19 ip4:74.84.144.37 ip4:74.84.144.46 ip4:50.31.43.252 ip4:168.245.122.109 ip4:184.107.80.100 ip4:184.107.80.111 ip4:184.107.80.101 ip4:184.107.80.123 ip4:184.107.80.119 ip4:184.107.63.100 ip4:174.142.116.50 ip4:174.142.116.51 ip4:174.142.116.39 ip4:174.142.116.40 ip4:69.196.241.0/24 ip4:37.216.222.128/28 ip4:131.239.197.90 ip4:216.228.143.87 ip4:50.217.145.132 include:spf.protection.outlook.com include:mailgun.org include:spf.symplicity.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.
Quarantine
TXTv=DMARC1; p=quarantine; sp=reject; adkim=s; aspf=s; fo=1; ri=86400; rua=mailto:dmarcreports@desu.edu; ruf=mailto:dmarcreports@desu.edu
Receivers are instructed to quarantine (route to spam) any mail that fails SPF or DKIM.
desu.edu Domain Registration WHOIS · Nameservers · Registrar
RegisteredOctober 25, 1995
Last UpdatedMarch 4, 2026
ExpiresJuly 31, 2028
Age30 years
TLD.edu
Authoritative Nameservers (2)
- SATURN.DESU.EDU
- AZDSUDNS.DESU.EDU
Registrant
Delaware State University
Dover, DE, UNITED STATES
Technical Contact
Domain Admin
svrmgrs@desu.edu·Dover, DE, UNITED STATES·13028577009
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Common Questions About desu.edu
Is desu.edu a disposable or temporary email provider?
No. desu.edu is not a disposable email provider. It is classified as Education Email operated by Delaware State University and addresses on desu.edu are persistent rather than throwaway. Mail sent to a valid desu.edu mailbox reaches a real recipient.
How do I verify if a desu.edu email address is valid?
The fastest way to verify a desu.edu email address is to use our free email checker. Enter any @desu.edu mailbox at the top of this page and our system performs a real-time SMTP handshake against desu.edu'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 desu.edu email exists without sending a message?
Yes. Our real-time email verification API connects directly to desu.edu'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 desu.edu mailbox is valid, full, or non-existent. The recipient never receives anything and never sees the check.
What are the MX records for desu.edu?
desu.edu currently publishes 1 mail exchange (MX) record. The primary MX is desu-edu.mail.protection.outlook.com, which is the first server contacted when other mail systems try to deliver email to a desu.edu 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 desu.edu.
Does desu.edu use SPF, DKIM, and DMARC email authentication?
desu.edu enforces all three email authentication standards: SPF, DKIM, and DMARC (policy: quarantine). This is the gold-standard configuration. It means receivers can verify that mail claiming to come from @desu.edu is genuine, and desu.edu's DMARC policy of 'quarantine' instructs receivers how to handle messages that fail those checks.
Why do emails to desu.edu bounce or get blocked?
Bounces from desu.edu 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 desu.edu'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 desu.edu's receivers trust you.
How can I verify a large list of desu.edu email addresses?
Our bulk email verifier accepts CSV or TXT uploads with thousands or millions of desu.edu addresses (or any mix of domains). Every address goes through 30+ checks including SMTP existence, desu.edu 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 desu.edu email addresses?
Yes, with normal hygiene. desu.edu is a legitimate email service and signups from @desu.edu 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 desu.edu by default.
What email format does desu.edu use for usernames?
Most desu.edu mailboxes follow common patterns like first.last@desu.edu, firstinitiallast@desu.edu, or first@desu.edu, but the actual local-part rules depend on Delaware State University. The only reliable way to confirm whether a specific @desu.edu 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 desu.edu risk score calculated?
The 0-to-100 risk score for desu.edu 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 desu.edu score is recomputed on every audit so it always reflects the live state of the domain.