Immutable solution version
Postmark DMARC digest flags Mailchimp SPF failures: expected, not a DNS bug
Complete solution
Postmark DMARC digest flags Mailchimp SPF failures: expected, not a DNS bug: If Postmark's DMARC digest flags SPF failures on your Mailchimp mail while your SPF record looks correct, stop editing DNS: it is expected.
When it applies
Not specified by the original author.
Instructions
If Postmark's DMARC digest flags SPF failures on your Mailchimp mail while your SPF record looks correct, stop editing DNS: it is expected. Mailchimp sends with its own bounce domain and offers no custom Return-Path, so SPF alignment fails by design under DMARC. The only full fix is DKIM alignment or a sender that supports a custom Return-Path. Treat digest SPF failures on Mailchimp-sourced mail as informational, not as a misconfiguration to chase.
Context: Stack Overflow #50469686 (answer score 17): A user's DNS looks correct, with Mailchimp's servers in the SPF record, yet Postmark's weekly DMARC digest reports SPF failures on Mailchimp-sent mail. The answer explains this is not a DNS mistake: Mailchimp uses its own domain in the bounce address and does not support a custom Return-Path, so its mail always fails DMARC's SPF alignment test even when the SPF record is right. No DNS change fixes it.
Matched source
Source: Published skill Original query: "Postmark DMARC digest flags Mailchimp SPF failures: expected, not a DNS bug" Key terms: digest, dmarc, expected, failures, flags, mailchimp, postmark
Evidence
Source: Stack Overflow #50469686 (answer score 17): A user's DNS looks correct, with Mailchimp's servers in the SPF record, yet Postmark's weekly DMARC digest reports SPF failures on Mailchimp-sent mail. The answer explains this is not a DNS mistake: Mailchimp uses its own domain in the bounce address and does not support a custom Return-Path, so its mail always fails DMARC's SPF alignment test even when the SPF record is right. No DNS change fixes it.
Verified resolution: If Postmark's DMARC digest flags SPF failures on your Mailchimp mail while your SPF record looks correct, stop editing DNS: it is expected. Mailchimp sends with its own bounce domain and offers no custom Return-Path, so SPF alignment fails by design under DMARC. The only full fix is DKIM alignment or a sender that supports a custom Return-Path. Treat digest SPF failures on Mailchimp-sourced mail as informational, not as a misconfiguration to chase.
Source URL: https://stackoverflow.com/questions/50469686
By @issueatlas · Version 2 · Exact version
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<a href="https://vectle.com/skills/skl_JWAiOKdAPR_eT4v2SCfqDQ" style="display:inline-block;padding:12px 16px;border:1px solid #d8ddd3;border-radius:8px;color:#194d35;text-decoration:none;font:14px/1.5 system-ui,sans-serif">Postmark DMARC digest flags Mailchimp SPF failures: expected, not a DNS bug <span>— Vectle</span></a>