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Michael Gorn's avatar
Michael Gorn
Iron Contributor
Feb 21, 2019

Emails showing up as external from Exchange Online to Exchange 2013 On-Premises

We are running Exchange 2013 CU21  in Hybrid mode. Emails from Exchange Online users to Exchange On-Premises users is showing up as external.  Transport rules that are supposed to apply only to external emails where "the sender is located" "Outside the organization" are erroneously being applied to emails that Exchange Online users are sending to the On-Premises users.

 

However, the emails from On-Premises users to Exchange Online users are showing up correctly as internal.

 

The header "X-MS-Exchange-Organization-AuthAs: Anonymous" is found in emails from Exchange Online to Exchange 2013 On-Premises users. When the emails are sent from Exchange 2013 On-Premises users to Exchange Online users, the header in the emails is "X-MS-Exchange-Organization-AuthAs: Internal". 

 

How do I fix this, so that the emails are showing as internal both ways?

 

Thank you.

exchange
hybrid
office 365
On-Premises

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  • Michael Gorn's avatar
    Michael Gorn
    Iron Contributor
    Feb 21, 2019

    PS C:\Users\> get-remotedomain CompanyName.com|fl

    DomainName : CompanyName.com
    IsInternal : True
    TargetDeliveryDomain : True
    ByteEncoderTypeFor7BitCharsets : Undefined
    CharacterSet :
    NonMimeCharacterSet :
    AllowedOOFType : InternalLegacy
    AutoReplyEnabled : True
    AutoForwardEnabled : True
    DeliveryReportEnabled : True
    NDREnabled : True
    MeetingForwardNotificationEnabled : True
    ContentType : MimeHtmlText
    DisplaySenderName : True
    PreferredInternetCodePageForShiftJis : Undefined
    RequiredCharsetCoverage :
    TNEFEnabled : True
    LineWrapSize : Unlimited
    TrustedMailOutboundEnabled : True
    TrustedMailInboundEnabled : True
    UseSimpleDisplayName : False
    NDRDiagnosticInfoEnabled : True
    MessageCountThreshold : 2147483647
    AdminDisplayName :
    ExchangeVersion : 0.1 (8.0.535.0)
    Name : CompanyName.com
    DistinguishedName : CN=CompanyName.com,CN=Internet Message Formats,CN=Global Settings,CN=Configuration,CN=CompanyName0.onmicrosoft.com,CN=ConfigurationUnits,DC=NAMPR25C003,DC=PROD,DC=OUTLOOK,DC=COM
    Identity : CompanyName.com
    ObjectCategory : NAMPR25C003.PROD.OUTLOOK.COM/Configuration/Schema/ms-Exch-Domain-Content-Config
    ObjectClass : {top, msExchDomainContentConfig}
    WhenChanged : 2/21/2019 11:20:58 AM
    WhenCreated : 2/19/2019 2:46:14 PM
    WhenChangedUTC : 2/21/2019 4:20:58 PM
    WhenCreatedUTC : 2/19/2019 7:46:14 PM
    OrganizationId : NAMPR25C003.PROD.OUTLOOK.COM/Microsoft Exchange Hosted Organizations/CompanyName0.onmicrosoft.com - NAMPR25C003.PROD.OUTLOOK.COM/ConfigurationUnits/CompanyName0.onmicrosoft.com/Configuration
    Id : CompanyName.com
    OriginatingServer : CM5PR12A005DC08.NAMPR25C003.PROD.OUTLOOK.COM
    IsValid : True
    ObjectState : Unchanged

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