Proofpoint receives mail for 510 of 9,971 popular domains we measured in November 2026. Below: the records it needs and how its customers actually set them.
MX hosts are assigned per customer, for example mxa-<id>.gslb.pphosted.com and mxb-<id>.gslb.pphosted.com (Proofpoint on Demand) or mx1-us1.ppe-hosted.com (Proofpoint Essentials).
Publish a TXT record at _dmarc.<domain> once SPF and DKIM pass for all mail you send, start with p=none and a reporting address, then move to p=quarantine or p=reject:
v=DMARC1; p=reject; rua=mailto:dmarc-reports@<domain>Provider site: https://www.proofpoint.com/
510 customer domains in the sample (accent bars) compared with all 9,971 measured domains (grey bars).
The highest-ranked domains in the sample whose MX records point to Proofpoint.
Check one yourself:
Customer-specific parts replaced by <domain> and digits by <n>.
| MX host pattern | Domains |
|---|---|
mxa-<n>.gslb.pphosted.com | 92 |
mxb-<n>.gslb.pphosted.com | 91 |
mxa-<n>a<n>.gslb.pphosted.com | 71 |
mxb-<n>a<n>.gslb.pphosted.com | 70 |
mxa-<n>c<n>.gslb.pphosted.com | 49 |
mxb-<n>c<n>.gslb.pphosted.com | 49 |
mxb-<n>f<n>.gslb.pphosted.com | 30 |
mxa-<n>f<n>.gslb.pphosted.com | 30 |
Source: our own scan of November 2026 (2026-11-11), 9,971 of the top 10,000 domains of the Tranco list Y895G that answered in DNS. Method and data.