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| domain | mailserver_registered_domain | email_provider | |
|---|---|---|---|
| coca-colacompany.com | ko.com | - | |
| searsholdings.com | searsholdings.com | - | |
| apple.com | apple.com | - | |
| amazon.com | amazon.com | - | |
| unitedhealthgroup.com | corpmailsvcs.com | - | |
| gm.com | gm.com | - | |
| lockheedmartin.com | lmco.com | - | |
| prudential.com | prudential.com | - | |
| pepsico.com | pepsico.com | - | |
| target.com | target.com | - | |
| merck.com | merck.com | - | |
| aig.com | aig.com | - | |
| hcahealthcare.com | medcity.net | - | |
| express-scripts.com | express-scripts.com | - | |
| allstate.com | allstate.com | - | |
| aetna.com | aetna.com | - | |
| morganstanley.com | morganstanley.com | - | |
| fedex.com | fedex.com | - | |
| libertymutual.com | lmig.com | - | |
| newyorklife.com | newyorklife.com | - | |
| boeing.com | boeing.net | - | |
| oracle.com | oracle.com | - | |
| tiaa-cref.org | tiaa-cref.org | - | |
| exxonmobil.com | exxonmobil.com | - | |
| freddiemac.com | freddiemac.com | - | |
| intel.com | intel.com | - | |
| chevron.com | chevron.com | - | |
| statefarm.com | statefarm.com | - | |
| walgreensbootsalliance.com | cscdns.net | CSC Digital Brand Services | |
| mondelezinternational.com | cscdns.net | CSC Digital Brand Services | |
| fanniemae.com | iphmx.com | Cisco Ironport | |
| cardinal.com | iphmx.com | Cisco Ironport | |
| metlife.com | metlife.com | Cisco Ironport | |
| 3m.com | iphmx.com | Cisco Ironport | |
| metlife.com | iphmx.com | Cisco Ironport | |
| energytransfer.com | iphmx.com | Cisco Ironport | |
| nationwide.com | iphmx.com | Cisco Ironport | |
| cisco.com | cisco.com | Cisco Ironport | |
| jnj.com | iphmx.com | Cisco Ironport | |
| lowes.com | fireeyecloud.com | FireEye | |
| google.com | google.com | ||
| wfscorp.com | outlook.com | Microsoft | |
| microsoft.com | outlook.com | Microsoft | |
| dow.com | outlook.com | Microsoft | |
| conocophillips.com | outlook.com | Microsoft | |
| honeywell.com | outlook.com | Microsoft | |
| adm.com | outlook.com | Microsoft | |
| disney.com | outlook.com | Microsoft | |
| berkshirehathaway.com | outlook.com | Microsoft | |
| johnsoncontrols.com | outlook.com | Microsoft | |
| aa.com | outlook.com | Microsoft | |
| hp.com | mimecast.com | Mimecast | |
| americanexpress.com | pphosted.com | Proofpoint | |
| ibm.com | pphosted.com | Proofpoint | |
| intlfcstone.com | pphosted.com | Proofpoint | |
| pg.com | pphosted.com | Proofpoint | |
| ups.com | pphosted.com | Proofpoint | |
| bankofamerica.com | pphosted.com | Proofpoint | |
| chsinc.com | pphosted.com | Proofpoint | |
| sysco.com | pphosted.com | Proofpoint | |
| utc.com | pphosted.com | Proofpoint | |
| ingrammicro.com | pphosted.com | Proofpoint | |
| generaldynamics.com | pphosted.com | Proofpoint | |
| walmart.com | pphosted.com | Proofpoint | |
| ge.com | pphosted.com | Proofpoint | |
| homedepot.com | pphosted.com | Proofpoint | |
| directv.com | pphosted.com | Proofpoint | |
| mckesson.com | pphosted.com | Proofpoint | |
| verizon.com | pphosted.com | Proofpoint | |
| amerisourcebergen.com | pphosted.com | Proofpoint | |
| halliburton.com | pphosted.com | Proofpoint | |
| tsocorp.com | pphosted.com | Proofpoint | |
| massmutual.com | pphosted.com | Proofpoint | |
| pfizer.com | pphosted.com | Proofpoint | |
| cigna.com | pphosted.com | Proofpoint | |
| gs.com | pphosted.com | Proofpoint | |
| costco.com | pphosted.com | Proofpoint | |
| cvshealth.com | pphosted.com | Proofpoint | |
| 21cf.com | pphosted.com | Proofpoint | |
| allstate.com | pphosted.com | Proofpoint | |
| citigroup.com | citi.com | Proofpoint | |
| marathonpetroleum.com | pphosted.com | Proofpoint | |
| att.com | pphosted.com | Proofpoint | |
| dupont.com | pphosted.com | Proofpoint | |
| johndeere.com | pphosted.com | Proofpoint | |
| delta.com | pphosted.com | Proofpoint | |
| bestbuy.com | pphosted.com | Proofpoint | |
| valero.com | messagelabs.com | Symantec | |
| wellsfargo.com | messagelabs.com | Symantec | |
| humana.com | messagelabs.com | Symantec | |
| safeway.com | messagelabs.com | Symantec | |
| ford.com | messagelabs.com | Symantec |
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Apple and Oracle use an on-prem version of Proofpoint and Amazon an on-prem version of Cisco's IronPort.
FedEx uses a mix of Symantec and Proofpoint on-prem.