Are you really trying to fix DMARC from your phone?
MailTender
Demo Inbox
These test messages show common authentication scenarios: a clean send, a broken DKIM signature, a misconfigured SPF record, a complete failure, and a marketing platform sending on behalf of a brand. Click Details → on any row for the full breakdown. Use your own address →

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@mailtender.io
DateFromSubjectSPFDKIMDMARCAuth
Ok?
Mar 25 5:04 PMinfo@acme-demo.comEverything passes — the happy pathpasspasspassDetails →
Mar 24 5:04 PMinfo@acme-demo.comDKIM signature broken — SPF alignment saves DMARCpassfailpassDetails →
Mar 23 5:04 PMinfo@acme-demo.comSPF misconfigured — DKIM alignment saves DMARCfailpasspassDetails →
Mar 22 5:04 PMinfo@acme-demo.comComplete authentication failure — SPF, DKIM, and DMARC all failfailfailfailDetails →
Mar 21 5:04 PMnewsletter@acme-demo.comSent via Pardont — envelope and header-from are different addressespassnot alignedpasspassDetails →