Hey Muhammed,
Thank you for raising this. As per latest Mail.Activities package version 1.19.0, we have the following header collection:
HeaderCollection(61) {
"Uid",
"Received",
"Authentication-Results",
"Received-SPF",
"X-PERCEPTION-POINT-VERDICT",
"X-PERCEPTION-POINT-SUB-VERDICT",
"X-PERCEPTION-POINT-SPAM",
"X-PERCEPTION-POINT-BEC-VERDICT",
"X-PP-Forefront-Antispam-Report",
"X-SES-Spam-Verdict",
"X-SES-Virus-Verdict",
"Authentication-Results-Original",
"X-SES-RECEIPT",
"X-SES-DKIM-SIGNATURE",
"DKIM-Signature",
"Date",
"From",
"Reply-To",
"To",
"Message-ID",
"Subject",
"MIME-Version",
"Content-Type",
"Content-Transfer-Encoding",
"X-Auto-Response-Suppress",
"Auto-Submitted",
"Feedback-ID",
"Return-Path",
"X-EOPAttributedMessage",
"X-EOPTenantAttributedMessage",
"X-MS-TrafficTypeDiagnostic",
"X-MS-Office365-Filtering-Correlation-Id",
"X-MS-Exchange-AtpMessageProperties",
"X-Microsoft-Antispam-Untrusted",
"X-Microsoft-Antispam-Message-Info-Original",
"X-Forefront-Antispam-Report-Untrusted",
"X-MS-Exchange-Transport-CrossTenantHeadersStamped",
"X-MS-Exchange-Organization-ExpirationStartTime",
"X-MS-Exchange-Organization-ExpirationStartTimeReason",
"X-MS-Exchange-Organization-ExpirationInterval",
"X-MS-Exchange-Organization-ExpirationIntervalReason",
"X-MS-Exchange-Organization-Network-Message-Id",
"X-MS-Exchange-Organization-MessageDirectionality",
"X-MS-Exchange-Transport-CrossTenantHeadersStripped",
"X-MS-PublicTrafficType",
"X-MS-Exchange-Organization-AuthSource",
"X-MS-Exchange-Organization-AuthAs",
"X-MS-Office365-Filtering-Correlation-Id-Prvs",
"X-MS-Exchange-Organization-SCL",
"X-Microsoft-Antispam",
"X-Forefront-Antispam-Report",
"X-MS-Exchange-CrossTenant-OriginalArrivalTime",
"X-MS-Exchange-CrossTenant-Network-Message-Id",
"X-MS-Exchange-CrossTenant-Id",
"X-MS-Exchange-CrossTenant-AuthSource",
"X-MS-Exchange-CrossTenant-AuthAs",
"X-MS-Exchange-CrossTenant-FromEntityHeader",
"X-MS-Exchange-Transport-EndToEndLatency",
"X-MS-Exchange-Processed-By-BccFoldering",
"X-Microsoft-Antispam-Mailbox-Delivery",
"X-Microsoft-Antispam-Message-Info"
}
Best regards,
Alex