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According to Live Direct Marketing's daily DNS scan (July 13, 2026), caltech.edu (Tranco rank #3,339) receives mail via Cisco IronPort and sends through Campaign Monitor, SendGrid (Twilio), Marketo (Adobe). Its DMARC policy is p=none (monitor only) — like the majority of DMARC publishers (53% don't enforce).
| Mailbox provider (MX) | Cisco IronPort |
|---|---|
| ESPs in SPF | Campaign Monitor, SendGrid (Twilio), Marketo (Adobe), Amazon SES |
| SaaS senders in SPF | Transact CashNet |
| DMARC policy | p=none |
| DMARC record | v=DMARC1; p=none; rua=mailto:6e39dba0@mxtoolbox.dmarc-report.com,mailto:caltech@us.cp-dmarc.com; ruf=mailto:6e39dba0@forensics.dmarc-report.com,mailto:caltech@us.cp-dmarc.com; fo=1 |
| Tranco rank | #3,339 |
| Snapshot | 2026-07-13 (updated daily) |
caltech.edu uses Cisco IronPort for inbound mail (detected from its primary MX record) as of July 13, 2026, per Live Direct Marketing's daily Tranco top-1M scan.
caltech.edu authorises Campaign Monitor, SendGrid (Twilio), Marketo (Adobe), Amazon SES in its SPF record as of July 13, 2026.
No — caltech.edu publishes p=none, which only monitors and does not block spoofing (as of July 13, 2026).