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How to set classification of an email automatically?

I have the following powershell script:
$Outlook = New-Object -ComObject Outlook.Application
$Mail = $Outlook.CreateItem(0)
$Mail.To = "receiver#host.com"
$Mail.Subject = "Hello"
$Mail.Body ="World"
$Mail.Send()
But when I execute it I have to select classification of the email manually: there appears a TITUS pop up with a the "Select Classification" title select box containing the following items: Public, For Internal Use Only and Private. I have to select an item and click "OK", after that the email is sent.
The script is supposed to be a job that gets run on schedule, so I don't want to interact with the script at all.
I have already walked through the whole msdn page of MailItem but I didn't come across anything similar to Classificaiton. What did I miss?
I am not an administrator of the server, so I don't have access to change anything.
PS: I selected the C# tag just because C# has the same API to interact with Outlook

Firstly, Outlook, just like any other Office app, is not designed to be used in unattended scenarios. It can and will display modal prompts out of the blue.
Secondly, to send a message, you can use straight SMTP, EWS, Extended MAPI (C++ or Delphi only), or Redemption (I am its author - its RDO family of objects wraps Extended MAPI and can be accessed for many language).
In your particular case, it sure looks like a custom third-party addin displaying a dialog box.

The mail object is not able to set the classification of the email object. If you pipe the object to Get-Member, you will see that there is no changeable property for the classification and/or a method to change it. You can find this by running the following command:
$Mail | Get-Member
Additionally, if you look at the list of properties there is not one that looks related to classification.
$Mail | Format-List
This blog post will probably help you, but it seems more complex than the solution you're looking for. This one utilizes Exchange instead of the Outlook client.

C# and Outlook Addin: Parsing all 'Received' fields from header for IMAP

I have searched for my problem and couldn't find any answer to it. There are similar questions to this, but not specifically mine. Any help or suggestion is appreciated.
I am working on an outlook add-in using C# (vs 2010). I will need to parse all of the "Received:" lines out of the header. Currently I am testing this on Outlook 2010.
By default, outlook will strip the header and keeps only what it needs. So no matter how to configure it, it will strip the header and if there are say 4 "Received" lines in the header, Outlook only keeps the last one.
Following the registry modification explained here, will partially solve the problem as it will retain the header only when Outlook is set to POP3. IMAP still has all of the "Received:" lines removed (except the last one).
The following is how I am getting the header using C# (this is part of a code that is called every time an email is selected in outlook):
const string PR_MAIL_HEADER_TAG = #"http://schemas.microsoft.com/mapi/proptag/0x007D001E";
Object selObject = this.Application.ActiveExplorer().Selection[1];
Outlook.MailItem mailItem = (selObject as Outlook.MailItem);
Outlook.PropertyAccessor oPA = mailItem.PropertyAccessor as Outlook.PropertyAccessor;
string Header = (string)oPA.GetProperty(PR_MAIL_HEADER_TAG);
This will give me the header, but only what Outlook has kept, nothing from the original email.
To clarify, opening the email and choosing File -> Properties -> Internet Header also only shows what is left from the header after outlook's modifications, not the original one.
The outlook option -> Action -> Other actions -> View Source also does not reveal what I am looking for.
So I am basically looking for a way to read IMAP original email source using within C#.

open outlook client with attachment

I want to open outlook client with files attached to it.
The requirement is that i want to remove some properties of the document and after properties are removed want to attach this files to outlook client.
Can anyone suggest me how to achieve this using C#.
Thanks in advance.

If I understand you,
you want to open a new email, whcih could be send by the user?
I implemented this one, and it looked like this code:
http://www.codeproject.com/Tips/165548/C-Code-snippet-to-send-an-Email-with-attachment-fr

Outlook Storage Example not finding body text in .MSG

I am using the excellent example at CodeProject to read .MSG files however many are coming back with no body text. I have stepped into the code and I believe this is because the property key __substg1.0_1000 of the Outlook message does not exist (GetMapiPropertyFromStreamOrStorage() method of Outlook Storage) in the message properties.
Do I need to look for an alternate property key to read the message body from these emails and if so what is it? Is there another way around this?

I'm not near a computer, well, I guess my phone is sort of a computer, but are you sure they're emails? Calendar and contact items generally won't have that property.
PidTagBody, PidTagHtmlBody, and PidTagRtfBody(?) are all properties that can contain body information. However, if there is an HTML or rtf body, you will almost always have PidTagBody property populated.
You can check the PidTagMessageClass property to determine if its an email, note, contact, etc. An email will have the value "IPM.Note". You'll have to look up the property ids for these names yourself, at least until I can get near a computer.

Outlook VSTO adding tracking pixel

I'm adding an img tracking pixel to items that have embedded content using my outlook addin which allows me to track when the person has open the email (pretty standard practice)
I do this by adding an image tag right before the closing body tag upon the send event.
The problem is, outlook then calls the url three times (twice with a method of "OPTIONS" and once with "GET"), this defeats the whole purpose of the tracking pixel because it triggers the event on send.
Does anyone know why outlook makes these requests, or how to get around this?

I see two possibilities:
Either Outlook or Exchange Server is checking the eMail content before sending it
OR
Outlook is configured to “When an HTML message contains pictures located on the Internet, send a copy of the pictures instead of the reference to their location” - for changing that setting in Outlook 2007/2010 via Registry see http://www.msoutlook.info/question/72
BTW: the two OPTIONS calls let me believe that Outlook is somehow checking the server of the linked image for WebDAV and/or Frontpage extensions...