Use SMTPClient To Send An Email Message?

Aug 3, 2010

This is my first time trying to create a windows application that can be used to send an email message. It's a new requirement that we have to satisfy. Our customer information is saved in a database and we needed to send them some advertisement messages to some or all of them.

I created a windows application but unfortunately I couldn't send a single email message.

I tried to modify my code several times with no luck; each time I'm getting a different exception message. I tried to search the wen for more information regarding this issue but I end up with the same result.

I don't know if I must have an smtp server to relay the messages and be able to send them. If this is the case how I can do that? Is it possible to accomplish this with something else.

Dim Message As MailMessage = New MailMessage()
Dim Smtp As New SmtpClient()
Dim SmtpUser As New System.Net.NetworkCredential()

[Code]....

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Dim SmtpServer As New SmtpClient()
Dim mail As New MailMessage()
Dim _Attachment As String[code]......

For Host Name I using mail dot metaprosystems dot com, the user name and password are the user name and password I use to log into my mail server. This work when the To address is within my domain. For example bob at-sign metaprosystems.com. It does not work when I send to an email outside my domain. I get this exception in my catch block: "Mailbox name not allowed. The server response was: sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)"

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Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
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[code]....

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[code]....

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The result:

The code:

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[code]....

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[code]....

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[code]....

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Here's my

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[CODE]...

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Dim SmtpServer
As
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[Code]....

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[Code]...

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[Code]...

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[Code]...

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[code]....

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