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The First National Bank in Sioux Falls, Sioux Falls, South Dakota, is the 566th largest FDIC-insured US bank by total assets ($2.1bn). On 4 November 2026 the public email records of fnbsf.com graded A: MX pass, SPF pass, DMARC p=quarantine, mail handled by Mimecast.
Grade A. Nothing in the records will stop mail. Read by DNS on 4 November 2026; the records are shown as published.
| Check | Result | What was published |
|---|---|---|
| MX | Pass | 10 us-smtp-inbound-1.mimecast.com, 10 us-smtp-inbound-2.mimecast.com. Mail handled by Mimecast |
| SPF | Pass | v=spf1 include:spf.cashedge.com include:sendgrid.net include:us._netblocks.mimecast.com include:spf.protection.outlook.com include:_spf1.fnbsf.com include:spfhost.messageprovider.com include:_spf.salesforce.com include:dnsexit.com ~all. DNS lookups: 10 or more of 10 allowed; ends ~all |
| DMARC | Pass | v=DMARC1; p=quarantine; rua=mailto:92150fbaddac4cafada7c67ab97e8c41@dmarc-reports.cloudflare.net, mailto:dmarc_rua@emaildefense.proofpoint.com; ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com;. Policy p=quarantine; reports collected (rua= set) |
| DKIM | Pass, not graded | Key found on selectors selector1, selector2, s1, s2 (of 10 common selectors tried) |
The First National Bank in Sioux Falls is the 566th largest FDIC-insured US bank by total assets, at $2.1bn as reported to the FDIC (certificate 4016; Sioux Falls, South Dakota). Among the 999 graded banks, The First National Bank in Sioux Falls ranks 386th by grade (ties broken by assets, larger first). In its asset band, $1bn to $10bn, it ranks 271st of 846; among the 17 graded banks in South Dakota, 8th. 66% of its band and 58.8% of its state graded A.
The checker's own notes on each record:
The First National Bank in Sioux Falls routes inbound mail through Mimecast, a filtering gateway. Expect strict inbound filtering: a message from a sender whose SPF, DKIM or DMARC fails, or whose domain has little sending history, is unlikely to reach a person. Before you send, run your own domain through the email setup checker and publish a policy with the DMARC record generator. For how a bank buys, see the selling to banks playbook.
The records above are from 4 November 2026. Run the same check on fnbsf.com now for today's result. The FDIC's record of the bank is at BankFind, certificate 4016.
This page is one of 1,000 in the Bank Email Readiness Index Q4 2026, published 4 November 2026 and re-read every quarter; the next edition is due 2 February 2027. If you work at The First National Bank in Sioux Falls and the records have changed, email moe@roimaxi.com and we will re-check and update this page.
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