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EMail Headers Used by Microsoft Exchange (Office 365)

Jayan Kandathil

First published

RFC 822 defines the standard for Internet email headers. Any header that starts with X- is a custom header.

Use an online tool such as MXToolbox to copy-paste and analyze email headers.

#Mail Header Name
Accept-Language
Authentication-Results
Content-Language
Content-Transfer-Encoding
Content-Type
Date
From
In-Reply-To
MIME-Version
Message-ID
Received
References
Return-Path
SpamDiagnosticOutput
Subject
Thread-Index
Thread-Topic
To
X-Auto-Response-Suppress
X-Exchange-Antispam-Report-CFA-Test
X-Forefront-Antispam-Report
X-MS-Exchange-Antispam-SRFA-Diagnostics
X-MS-Exchange-AtpMessageProperties
X-MS-Exchange-CrossTenant-FromEntityHeader
X-MS-Exchange-CrossTenant-Id
X-MS-Exchange-CrossTenant-Network-Message-Id
X-MS-Exchange-CrossTenant-OriginalArrivalTime
X-MS-Exchange-Organization-AuthAs
X-MS-Exchange-Organization-AuthMechanism
X-MS-Exchange-Organization-AuthSource
X-MS-Exchange-Organization-ExpirationInterval
X-MS-Exchange-Organization-ExpirationIntervalReason
X-MS-Exchange-Organization-ExpirationStartTime
X-MS-Exchange-Organization-ExpirationStartTimeReason
X-MS-Exchange-Organization-MessageDirectionality
X-MS-Exchange-Organization-Network-Message-Id
X-MS-Exchange-Organization-SCL
X-MS-Exchange-Processed-By-BccFoldering
X-MS-Exchange-Transport-CrossTenantHeadersStamped
X-MS-Exchange-Transport-EndToEndLatency
X-MS-Has-Attach
X-MS-Office365-Filtering-Correlation-Id
X-MS-Office365-Filtering-HT
X-MS-PublicTrafficType
X-MS-TNEF-Correlator
X-MS-TrafficTypeDiagnostic
X-Microsoft-Antispam
X-Microsoft-Antispam-Mailbox-Delivery
X-Microsoft-Antispam-Message-Info
X-Microsoft-Exchange-Diagnostics
X-Originating-IP

See index for all entries in this blog.