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How to send email using vb.net?


its been a pain trying to get my application to compose an email, but i finally managed to get it working but I have a couple questions:-
1) It seems that there is some sort of character limit on the following method, if the text in the body of the email contains a lot of information then it cuts it off at the bottom?
2) I have seen examples of some people being able to change the font type, size and colour of the text - how would I use this with the following coding?

       Dim sParams As String = ""
        Dim emailto As String = "test@test.co.uk"
        Dim subject As String = "test"
        Dim body As String = ""
        Dim LineCounter As Integer = 0
        Dim Lines As String = ""
        body = body & "The"
        body = body & "%0A"
        body = body & "%0A" & "Body"
        body = body & "%0A"
        body = body & "%0A" & "Of"
        body = body & "%0A"
        body = body & "%0A" & "The"
        body = body & "%0A"
        body = body & "%0A" & "Email"
        body = body & "%0A"
        body = body & "%0A" & "Goes"
        body = body & "%0A"
        body = body & "%0A" & "Here"

        sParams = "mailto:" & emailto & "?subject=" & subject & "&body=" & body
        Catch e2 As Exception
            MessageBox.Show("Unable to load email!", "Problem Sending the email", MessageBoxButtons.OK, MessageBoxIcon.Error)
        End Try

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I know there are other methods like smtp but i am happy with the above method as it composes emails in outlook which is perfect, i dont require it to send emails just compose.
Visual Basic.NET

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Last Comment

8/22/2022 - Mon
Shaun Kline

The method you are using is analogous to using a link on a webpage to open up the email software on a user's PC and prepopulating the email with various pieces of information. Using this method, you can only use text for the components (from, to, body), which prevents defining fonts, colors and styles, and has the limitations of what can go in a web browser's address bar, which I believe is 2K of text, at least in Internet Explorer.

If you want more features, you will either need to write your code to use Outlook's APIs or use .NET's System.Net.Mail classes.

hi, thanks for your response, are you able to provide me a link to some code or a demo program that will set me on the right track? thanks.
Shaun Kline

For using the System.Net.Mail classes, here is an example.

For using the Outlook APIs, here is an example.
Your help has saved me hundreds of hours of internet surfing.

Ok, so after some research I tried to use the following coding

Dim OutlookMessage As Outlook.MailItem
        Dim AppOutlook As New Outlook.Application

        Dim objNS As Outlook._NameSpace = AppOutlook.Session
        Dim objFolder As Outlook.MAPIFolder
        objFolder = objNS.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderDrafts)

            OutlookMessage = AppOutlook.CreateItem(Outlook.OlItemType.olMailItem)
            Dim Recipents As Outlook.Recipients = OutlookMessage.Recipients
            OutlookMessage.Subject = "Sending through Outlook"
            OutlookMessage.Body = "Testing outlook Mail"
            OutlookMessage.BodyFormat = Outlook.OlBodyFormat.olFormatHTML

        Catch ex As System.Exception
            MessageBox.Show("Mail could not be sent") 'if you dont want this message, simply delete this line    
            OutlookMessage = Nothing
            AppOutlook = Nothing
        End Try

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However I get an error of

Unable to cast COM object of type 'System.__ComObject' to interface type 'Microsoft.Office.Interop.Outlook.MailItem'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{00063034-0000-0000-C000-000000000046}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).

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On the following line

OutlookMessage = AppOutlook.CreateItem(Outlook.OlItemType.olMailItem)

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I could not find much help online with this error, so I thought of another way.  Maybe I save a template from outlook of an email (.msg) and then I could use my program to open this .msg in outlook.  So I tried to use the following coding

Dim oApp As New outlook.Application
        Dim mitem As Outlook.MailItem
        mitem = oApp.CreateItemFromTemplate("C:\test\OutlookTest.msg")

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But I get the same error which is driving me mad on line

mitem = oApp.CreateItemFromTemplate("C:\test\OutlookTest.msg")

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Would this indicate to be a problem with outlook?
Shaun Kline

It does not necessarily indicate a problem with Outlook. From the code you first posted, you may need to explicitly cast the return object from AppOutlook.CreateItem to an Outlook.MailItem using CType, as shown in the link originally provided.

It also may be caused by the differences in the version of Outlook you are using as compared to the example provided. There is a comment at this link (http://support.microsoft.com/kb/313787) that Outlook 10 and Outlook 11 are referenced differently when used in .Net code.

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Shaun Kline

You can use this page for reference to all of the properties of a MailItem: http://msdn.microsoft.com/en-us/library/office/ff861332(v=office.15).aspx
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Found sollution myself.