Capital One: email security grade A

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Capital One, Mclean, Virginia, is the 7th largest FDIC-insured US bank by total assets ($662bn). On 4 November 2026 the public email records of capitalone.com 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 capitalone.com

Check	Result	What was published
MX	Pass	`10 mx0a-001b4103.pphosted.com`, `10 mx0b-001b4103.pphosted.com`. Mail handled by Proofpoint
SPF	Pass	`v=spf1 ip4:148.163.151.254 ip4:148.163.155.198 ip4:148.163.137.70 ip4:148.163.133.70 ip4:205.220.175.235 ip4:205.220.163.236 ip4:27.126.144.0/21 ip4:64.106.247.198 ip4:66.70.7.91 ip4:68.233.76.14 ip4:97.107.118.192/26 ip4:63.150.74.35 include:gspf.capitalone.com include:gspf2.capitalone.com include:spf1.capitalone.com include:spf2.capitalone.com include:mir.capitalone.com include:sf.capitalone.com include:sf2.capitalone.com ~all`. DNS lookups: 7 of 10 allowed; ends ~all
DMARC	Pass	`v=DMARC1; p=reject; fo=1; ri=3600; rua=mailto:capital-one@rua.agari.com; ruf=mailto:capital-one@ruf.agari.com`. Policy p=reject; reports collected (rua= set)
DKIM	Pass, not graded	Key found on selectors k1, s1, s2 (of 10 common selectors tried)

Where Capital One ranks

Capital One is the 7th largest FDIC-insured US bank by total assets, at $662bn as reported to the FDIC (certificate 4297; Mclean, Virginia). Among the 999 graded banks, Capital One ranks 6th by grade (ties broken by assets, larger first). In its asset band, $100bn and over, it ranks 6th of 31; among the 28 graded banks in Virginia, 1st. 96.8% of its band and 82.1% 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: 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 capital-one@rua.agari.com.
DKIM, pass: DKIM key found at k1._domainkey.capitalone.com, about 1024-bit RSA.
DKIM, pass: DKIM key found at s1._domainkey.capitalone.com, about 2048-bit RSA.
DKIM, pass: DKIM key found at s2._domainkey.capitalone.com, about 1024-bit RSA.

What this means if you sell to Capital One

Capital One 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 capitalone.com now for today's result. The FDIC's record of the bank is at BankFind, certificate 4297.

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 Capital One 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