Sterling Bank: email security grade A

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Sterling Bank, Poplar Bluff, Missouri, is the 705th largest FDIC-insured US bank by total assets ($1.6bn). On 4 November 2026 the public email records of sterbank.bank graded A: MX pass, SPF pass, DMARC p=reject, mail handled by Proofpoint.

Grade A. Nothing in the records will stop mail. Read by DNS on 4 November 2026; the records are shown as published.

What was found on sterbank.bank

Check	Result	What was published
MX	Pass	`10 mxa-00598c01.gslb.pphosted.com`. Mail handled by Proofpoint
SPF	Pass	`v=spf1 mx a ip4:50.58.8.0/22 ip4:67.231.144.0/20 ip4:148.163.128.0/19 ip4:166.73.92.63/32 ip4:167.89.15.50 a:mail.sterbank.com include:spf-00598c01.pphosted.com include:spf.emailsignatures365.com include:spf.cashedge.com include:spf.protection.outlook.com -all`. DNS lookups: 7 of 10 allowed; ends -all
DMARC	Pass	`v=DMARC1; p=reject; sp=reject; ruf=mailto:DMARC@sterbank.bank; rua=mailto:DMARC@sterbank.bank`. Policy p=reject, subdomains sp=reject; reports collected (rua= set)
DKIM	Pass, not graded	Key found on selector selector1 (of 10 common selectors tried)

Where Sterling Bank ranks

Sterling Bank is the 705th largest FDIC-insured US bank by total assets, at $1.6bn as reported to the FDIC (certificate 57813; Poplar Bluff, Missouri). Among the 999 graded banks, Sterling Bank ranks 478th by grade (ties broken by assets, larger first). In its asset band, $1bn to $10bn, it ranks 363rd of 846; among the 35 graded banks in Missouri, 13th. 66% of its band and 57.1% of its state graded A.

What this means for the bank

The checker's own notes on each record:

MX, pass: 1 MX record. Replies have somewhere to land.
SPF, pass: One SPF record, ending in -all (fail): mail from a server that is not on the list should be rejected.
SPF, info: DNS lookups: about 7 of the 10 allowed. This count is an estimate.
DMARC, pass: Policy p=reject: receivers are asked to refuse mail that fails.
DMARC, info: Reports go to DMARC@sterbank.bank.
DKIM, pass: DKIM key found at selector1._domainkey.sterbank.bank, about 2048-bit RSA.

What this means if you sell to Sterling Bank

Sterling Bank routes inbound mail through Proofpoint, 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.

Check it live

The records above are from 4 November 2026. Run the same check on sterbank.bank now for today's result. The FDIC's record of the bank is at BankFind, certificate 57813.

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 Sterling Bank and the records have changed, email moe@roimaxi.com and we will re-check and update this page.

ROI Maximizer is a trading name of M Ventures LTD, registered in England and Wales, company no. 15554493. Registered office: 4 Beau Street, Bath BA1 1QY, United Kingdom. moe@roimaxi.com