Old Second National Bank: email security grade B

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Old Second National Bank, Aurora, Illinois, is the 215th largest FDIC-insured US bank by total assets ($6.9bn). On 4 November 2026 the public email records of oldsecond.com graded B: MX pass, SPF pass, DMARC p=quarantine, mail handled by Cisco Secure Email.

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 oldsecond.com

Check	Result	What was published
MX	Pass	`5 mx1.hc7041-26.iphmx.com`, `5 mx2.hc7041-26.iphmx.com`. Mail handled by Cisco Secure Email
SPF	Pass	`v=spf1 mx ip4:12.48.114.56 ip4:12.23.207.40 ip4:68.232.153.97 ip4:216.71.155.178 ip4:23.21.109.197 ip4:23.21.109.212 ip4:147.160.167.0/26 ip4:149.72.249.133 ip4:149.72.28.49 ip4:149.72.28.198 ip4:50.31.35.233 include:_spf.oldsecond.com ~all`. DNS lookups: 8 or more of 10 allowed; ends ~all
DMARC	Warn	`v=DMARC1; p=quarantine; rua=mailto:668d62c7a820b@ag.dmarcly.com; ruf=mailto:668d62c7a820b@fo.dmarcly.com; sp=none; fo=0:1:d:s;`. Policy p=quarantine, subdomains sp=none; reports collected (rua= set)
DKIM	Pass, not graded	Key found on selectors selector1, selector2, s1 (of 10 common selectors tried)

Where Old Second National Bank ranks

Old Second National Bank is the 215th largest FDIC-insured US bank by total assets, at $6.9bn as reported to the FDIC (certificate 3603; Aurora, Illinois). Among the 999 graded banks, Old Second National Bank ranks 713th by grade (ties broken by assets, larger first). In its asset band, $1bn to $10bn, it ranks 572nd of 846; among the 52 graded banks in Illinois, 45th. 66% of its band and 82.7% 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 (softfail): mail from a server that is not on the list is treated as suspect.
SPF, info: DNS lookups: at least 8 of the 10 allowed. One more sending service could push it over. This count is an estimate.
SPF, info: The record uses SPF macros, which only resolve for a real message, so the lookup count is a floor.
DMARC, pass: Policy p=quarantine: receivers are asked to put mail that fails in spam.
DMARC, warn: sp=none: mail claiming to come from a subdomain of oldsecond.com gets no policy, so the subdomains can be spoofed.
DMARC, info: Reports go to 668d62c7a820b@ag.dmarcly.com.
DKIM, pass: DKIM key found at selector1._domainkey.oldsecond.com, about 1024-bit RSA.
DKIM, pass: DKIM key found at selector2._domainkey.oldsecond.com, about 1024-bit RSA.
DKIM, pass: DKIM key found at s1._domainkey.oldsecond.com, about 2048-bit RSA.

What this means if you sell to Old Second National Bank

Old Second National Bank routes inbound mail through Cisco Secure Email, 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 oldsecond.com now for today's result. The FDIC's record of the bank is at BankFind, certificate 3603.

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 Old Second National 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