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Cornerstone Bank, Spencer, Massachusetts, is the 480th largest FDIC-insured US bank by total assets ($2.6bn). On 4 November 2026 the public email records of cornerstonebank.com graded B: MX pass, SPF pass, DMARC p=none, mail handled by Microsoft 365.
Grade B. One setting does less than it seems to. Read by DNS on 4 November 2026; the records are shown as published.
| Check | Result | What was published |
|---|---|---|
| MX | Pass | 0 cornerstonebank-com.mail.protection.outlook.com. Mail handled by Microsoft 365 |
| SPF | Pass | v=spf1 mx include:spf.cocci.com include:sendgrid.net include:spfhost.messageprovider.com include:spf.cashedge.com include:_spf.elasticemail.com include:amazonses.com ip4:66.180.11.11 ip4:51.222.89.34 ip4:216.116.80.0/24 ip4:216.116.81.88 ip4:216.116.87.0/24 ip4:74.200.60.0/24 ip4:74.200.63.0/24 ip4:216.116.95.0/24 ip4:52.128.98.34 ip4:52.128.98.35 ip4:52.128.98.36 ip4:205.220.177.135 ip4:205.220.166.201 ip4:52.128.103.21 ip4:52.128.103.23 ip4:52.128.103.24 ip4:66.159.240.191 ip4:66.159.238.164 ip4:173.195.98.237 ip4:159.183.138.216 ip4:209.61.151.0/24 ip4:166.78.68.0/22 ip4:198.61.254.0/23 ip4:192.237.158.0/23 ip4:23.253.182.0/23 ip4:104.130.96.0/28 ip4:146.20.113.0/24 ip4:146.20.191.0/24 ip4:159.135.224.0/20 ip4:69.72.32.0/20 ip4:104.130.122.0/23 ip4:146.20.112.0/26 ip4:161.38.192.0/20 ip4:143.55.224.0/21 ip4:143.55.232.0/22 ip4:159.112.240.0/20 ip4:198.244.48.0/20 ip4:204.220.168.0/21 ip4:204.220.176.0/20 ip4:141.193.32.0/23 ip4:159.135.140.80/29 ip4:159.135.132.128/25 ip4:161.38.204.0/22 ip4:87.253.232.0/21 ip4:185.189.236.0/22 ip4:185.211.120.0/22 ip4:185.250.236.0/22 ip4:143.55.236.0/22 ip4:198.244.60.0/22 ip4:204.220.160.0/21 include:spf.protection.outlook.com -all. DNS lookups: 10 or more of 10 allowed; ends -all |
| DMARC | Warn | v=DMARC1; p=none; rua=mailto:misreports@cornerstonebank.com; ruf=mailto:misreports@cornerstonebank.com; fo=1. Policy p=none; reports collected (rua= set) |
| DKIM | Pass, not graded | Key found on selectors selector1, s1, s2 (of 10 common selectors tried) |
Cornerstone Bank is the 480th largest FDIC-insured US bank by total assets, at $2.6bn as reported to the FDIC (certificate 90282; Spencer, Massachusetts). Among the 999 graded banks, Cornerstone Bank ranks 786th by grade (ties broken by assets, larger first). In its asset band, $1bn to $10bn, it ranks 645th of 846; among the 47 graded banks in Massachusetts, 34th. 66% of its band and 61.7% of its state graded A.
The checker's own notes on each record:
Cornerstone Bank receives mail through Microsoft 365, whose Exchange Online Protection checks every inbound message's SPF, DKIM and DMARC and scores the sender's reputation. A clean, warmed sending domain is the minimum; a failed check lands in junk or is dropped. 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 cornerstonebank.com now for today's result. The FDIC's record of the bank is at BankFind, certificate 90282.
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 Cornerstone 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
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