Result of the MailScanner process, whether it was spam or not.
From-header received by MailScanner.
If mail was marked as spam, this will hold the spamscore.
Date at which the e-mail was sent.
Original Arrival Time
This is a time stamp placed on the message when it first passes through a Microsoft Exchange server.
The type of content that is being sent via mail.
The encoding used to send the message.
Another MIME header, telling MIME-compliant mail programs what type of content to expect in the message.
How the content of the mail should be handled (inline, attachment, ...).
The mailclient or mailing software used to send out the e-mail.
The mailing software that the client has identified himself as.
The priority with which this e-mail was sent.
A custom header, to show the real sender e-mail address.
Microsoft Mail Priority
The priority as entered in Microsoft Mail.
User Agent used to send the e-mail.
Mime OLE software used by the sender.
Is used for associating multiple messages to a similar thread. For example, in Outlook the conversation view would use this information to find messages in one conversation thread.
The Transport Neutral Encapsulation Format is Microsoft Exchange/Outlook specific, used when sending messages formatted as Rich Text Format (RTF).
Informs that the client is ready to send attachments and it also informs whether or not the e-mail contains any attachments. If the e-mail contains attachments the information header X-MS-Has-Attach: will say "yes" after colon.
Usually the original subject, used as the readable version of Thread-Index.