Chilkat HOME .NET Core C# Android™ AutoIt C C# C++ Chilkat2-Python CkPython Classic ASP DataFlex Delphi ActiveX Delphi DLL Go Java Lianja Mono C# Node.js Objective-C PHP ActiveX PHP Extension Perl PowerBuilder PowerShell PureBasic Ruby SQL Server Swift 2 Swift 3,4,5... Tcl Unicode C Unicode C++ VB.NET VBScript Visual Basic 6.0 Visual FoxPro Xojo Plugin
(VB.NET) Email Received Header Fields
Received emails will contain one or more "Received" header fields at the beginning of the email header. Each SMTP server (along the delivery path) adds a Received header to the top of the incoming message. The delivery route can be ascertained by the sequence of Received headers. There is a good summary of the Received header here.
The following explanation is taken from the reference URL above:
In theory, the value of a Received field is tokenizable. It contains 1) optionally, a "from" atom followed by an encoded domain name; 2) optionally, a "by" atom followed by an encoded domain name; 3) optionally, a "via" atom followed by another atom; 4) zero or more of the following: a "with" atom followed by another atom; 5) optionally, an "id" atom followed by either (1) an atom or (2) a < token, an encoded address, and a > token; 6) optionally, a "for" atom followed by an encoded address; 7) a semicolon; and 8) a timestamp.
In practice, SMTP servers put all sorts of badly formatted information into Received lines. It is probably best for readers to treat everything before the final semicolon as unstructured text, purely for human consumption.
This example demonstrates iterating over each of the Recevied headers and getting the content of each.
Dim email As New Chilkat.Email ' Load a .eml file into the email object. Dim success As Boolean = email.LoadEml("/home/users/chilkat/eml/myEml.eml") If (success = False) Then Debug.WriteLine(email.LastErrorText) Exit Sub End If Dim sbHdrName As New Chilkat.StringBuilder Dim i As Integer = 0 Dim numHeaders As Integer = email.NumHeaderFields While i < numHeaders sbHdrName.SetString(email.GetHeaderFieldName(i)) If (sbHdrName.ContentsEqual("Received",False) = True) Then Debug.WriteLine("Received: " & email.GetHeaderFieldValue(i)) End If i = i + 1 End While
© 2000-2023 Chilkat Software, Inc. All Rights Reserved.