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According to Live Direct Marketing's daily DNS scan (July 13, 2026), nsf.gov (Tranco rank #4,583) receives mail via Unknown / Other and sends through Constant Contact, Salesforce, Amazon SES. Its DMARC policy is p=reject — one of the minority (47%) of DMARC publishers that actually enforce.
| Mailbox provider (MX) | Unknown / Other |
|---|---|
| ESPs in SPF | Constant Contact, Salesforce, Amazon SES |
| SaaS senders in SPF | Aventri (Stova) |
| DMARC policy | p=reject |
| DMARC record | v=DMARC1;p=reject; fo=1; pct=100;rua=mailto:dmarcemails@nsf.gov,mailto:reports@dmarc.cyber.dhs.gov; ruf=mailto:fremailsdmarc@nsf.gov,mailto:reports@dmarc.cyber.dhs.gov; |
| Tranco rank | #4,583 |
| Snapshot | 2026-07-13 (updated daily) |
nsf.gov uses Unknown / Other for inbound mail (detected from its primary MX record) as of July 13, 2026, per Live Direct Marketing's daily Tranco top-1M scan.
nsf.gov authorises Constant Contact, Salesforce, Amazon SES in its SPF record as of July 13, 2026.
Yes — nsf.gov publishes p=reject, the strictest DMARC policy (as of July 13, 2026).