Proton Mail receives mail for 33 of 9,971 popular domains we measured in November 2026. Below: the records it needs and how its customers actually set them.
| Host | Priority |
|---|---|
mail.protonmail.ch | 10 |
mailsec.protonmail.ch | 20 |
Add include:_spf.protonmail.ch to the domain's single SPF record, for example:
v=spf1 include:_spf.protonmail.ch -all31 of 33 Proton Mail customers in our sample (93.9%) have this include in their SPF record.
Three CNAME records, protonmail._domainkey, protonmail2._domainkey and protonmail3._domainkey, pointing to the targets shown in Proton's domain settings.
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>Official documentation: MX · DMARC
Provider site: https://proton.me/mail
33 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 Proton Mail.
Check one yourself:
Customer-specific parts replaced by <domain> and digits by <n>.
| MX host pattern | Domains |
|---|---|
mail.protonmail.ch | 33 |
mailsec.protonmail.ch | 31 |
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.