ESP AUTHENTICATION GUIDESPF Lookups: 1 / 10DKIM Type: CNAMEBIMI: Supported
How to Set Up SPF & DKIM for Proton Mail for Business: DNS Authentication Guide
Configure authoritative DNS records for Proton Mail for Business. Prevent spoofing, maintain high inbox placement at Google & Yahoo, and verify alignment without exceeding RFC 7208 lookup limits.
Required DNS Records for Proton Mail for Business
1. Sender Policy Framework (SPF)
Type: TXTHost / Name:@
Value / Content:
v=spf1 include:_spf.protonmail.ch ~allUses 1 of your domain's 10 allowed DNS lookups under RFC 7208. Do not add duplicate SPF TXT records.
2. DomainKeys Identified Mail (DKIM)
Type: CNAMESelector / Host Name:protonmail._domainkey
Target / Key Content:
protonmail.domainkey.yourcompany.comDelegates cryptographic signing to Proton Mail for Business. Alignment mode is set to strict.
Recommended DMARC Policy for Proton Mail for Business
Once both SPF and DKIM are verified on your domain, enforce DMARC to prevent attackers from sending unauthorized emails spoofing your brand:
v=DMARC1; p=reject; rua=mailto:dmarc-reports@yourcompany.com; pct=100; aspf=s; adkim=sVendor Resources & RFC Standards
DNS Infrastructure Guides
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