Is sec.gov a valid email domain?
sec.gov can receive email. It publishes 1 mail server, run by Microsoft (Outlook or Microsoft 365), and the first choice is sec-gov.mail.protection.outlook.com.
It is not a free provider and is not on our disposable list, so addresses here usually belong to a company, school or other organisation.
SPF is published and ends with -all. DMARC is set to reject.
Check an email address at sec.gov
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MX records (Microsoft (Outlook or Microsoft 365))
| Priority | Mail server | Resolves to |
|---|---|---|
| 10 | sec-gov.mail.protection.outlook.com | 52.101.60.170, 52.101.60.168 |
SPF
Record published
v=spf1 include:_mail.sec.gov include:_sas.sec.gov include:_sas1.sec.gov include:_sas2.sec.gov ip4:162.138.52.160 ip4:162.138.52.161 ip4:162.138.53.160 ip4:162.138.53.161 include:spf.protection.outlook.com -all
DMARC
Policy: reject
v=DMARC1; p=reject; pct=100; rua=mailto:DMARC@sec.gov!10m,mailto:SOCReporting@sec.gov!10m,mailto:reports@dmarc.cyber.dhs.gov
Disposable?
No, not on our disposable list.
Free provider?
No, not a known free provider.
What this means for your email list
What this means for addresses at this domain
Mail routing for sec.gov is healthy, so the domain is not the risk. The risk is the mailbox: outdated contacts, shared inboxes and catch-all servers. A mailbox-level check tells you which addresses are safe to send to.
Sender authentication
sec.gov has a strict DMARC policy (reject): mail that fails authentication is refused, which protects its brand from spoofing and means anyone sending as sec.gov must have SPF and DKIM set up correctly.
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Sign up to get a report summary →Frequently asked questions
- Is sec.gov a valid email domain?
- Yes. sec.gov publishes 1 MX record and can receive email. Whether a particular mailbox exists is a separate question that only a mailbox check can answer.
- Is sec.gov a disposable email domain?
- No. sec.gov is not on our disposable list. The list is updated regularly, and new throwaway domains appear all the time.
- What are the MX records for sec.gov?
- sec-gov.mail.protection.outlook.com (priority 10).
- Does sec.gov have SPF and DMARC?
- SPF: yes, ending -all. DMARC: yes, policy reject.