Security First Bank: email security grade B

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Security First Bank, Lincoln, Nebraska, is the 524th largest FDIC-insured US bank by total assets ($2.3bn). On 4 November 2026 the public email records of security1stbank.com graded B: MX pass, SPF pass, DMARC p=none, mail handled by Proofpoint.

Grade B. One setting does less than it seems to. Read by DNS on 4 November 2026; the records are shown as published.

What was found on security1stbank.com

Check	Result	What was published
MX	Pass	`0 mxa-0040e101.gslb.pphosted.com`, `0 mxb-0040e101.gslb.pphosted.com`. Mail handled by Proofpoint
SPF	Pass	`v=spf1 include:spf.protection.outlook.com include:spf-0040e101.pphosted.com include:spfhost.messageprovider.com include:spf.internet-estatements.com include:246748416.spf01.hubspotemail.net ip4:67.231.144.53 ip4:67.231.156.37 -all`. DNS lookups: 5 of 10 allowed; ends -all
DMARC	Warn	`v=DMARC1;p=none;rua=mailto:rua@dmarc.brevo.com`. Policy p=none; reports collected (rua= set)
DKIM	Reported, not graded	No key on any of 10 common selectors. This proves nothing: the bank's real selectors may be any name

Where Security First Bank ranks

Security First Bank is the 524th largest FDIC-insured US bank by total assets, at $2.3bn as reported to the FDIC (certificate 5415; Lincoln, Nebraska). Among the 999 graded banks, Security First Bank ranks 793rd by grade (ties broken by assets, larger first). In its asset band, $1bn to $10bn, it ranks 652nd of 846; among the 22 graded banks in Nebraska, 19th. 66% of its band and 77.3% of its state graded A.

What this means for the bank

The checker's own notes on each record:

MX, pass: 2 MX records. 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 5 of the 10 allowed. This count is an estimate.
DMARC, warn: Policy p=none: receivers are asked to do nothing with mail that fails. Reports are on, so you can see what fails.
DMARC, info: Reports go to rua@dmarc.brevo.com.
DKIM, info: No DKIM key at the 10 common selectors tried. That does not mean DKIM is missing. Your email provider picks the selector name, and DNS has no way to list them.

What this means if you sell to Security First Bank

Security First 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 security1stbank.com now for today's result. The FDIC's record of the bank is at BankFind, certificate 5415.

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 Security First 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