(VB.NET) Rename Email Attachments After Adding

Demonstrates how to rename email attachments after adding but before sending.

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim mailman As New Chilkat.MailMan

mailman.SmtpHost = "smtp.my-mail-server.com"
mailman.SmtpUsername = "MY_SMTP_USERNAME"
mailman.SmtpPassword = "MY_SMTP_PASSWORD"
mailman.SmtpSsl = True
mailman.SmtpPort = 465

Dim email As New Chilkat.Email

email.Subject = "This is a test"
email.Body = "This is a test"
email.From = "Chilkat Support <support@chilkatsoft.com>"
Dim success As Boolean = email.AddTo("Chilkat Admin","admin@chilkatsoft.com")
' To add more recipients, call AddTo, AddCC, or AddBcc once per recipient.

' Add some attachments.
' The AddFileAttachment method returns the value of the content-type it chose for the attachment.
Dim contentType As String = email.AddFileAttachment("qa_data/jpg/starfish.jpg")
If (email.LastMethodSuccess <> True) Then
    Debug.WriteLine(email.LastErrorText)
    Exit Sub
End If

contentType = email.AddFileAttachment("qa_data/pdf/fishing.pdf")
If (email.LastMethodSuccess <> True) Then
    Debug.WriteLine(email.LastErrorText)
    Exit Sub
End If


' If we save the email to a .eml, we can examine in a text editor.
success = email.SaveEml("qa_output/e1.eml")
If (success = False) Then
    Debug.WriteLine(email.LastErrorText)
    Debug.WriteLine("Failed to save .eml")
    Exit Sub
End If


' We see the following in the e1.eml
' Notice that Chilkat replaced the full path with just the filename.
' The full local path is not part of the email that gets sent..

' ...
' --------------020807050607070004010609
' Content-Type: image/jpeg; name="starfish.jpg"
' Content-Transfer-Encoding: base64
' Content-Disposition: attachment; filename="starfish.jpg"
' 
' ...
' --------------020807050607070004010609
' Content-Type: application/pdf; name="fishing.pdf"
' Content-Transfer-Encoding: base64
' Content-Disposition: attachment; filename="fishing.pdf"
' ...


' Before sending, each filename can be changed within the email object.
' For example:
success = email.SetAttachmentFilename(0,"orange_starfish.jpg")
success = email.SetAttachmentFilename(1,"tuna_fishing.pdf")

' Look at the new MIME source of the email in a  text editor...
success = email.SaveEml("qa_output/e2.eml")
If (success = False) Then
    Debug.WriteLine(email.LastErrorText)
    Debug.WriteLine("Failed to save .eml")
    Exit Sub
End If


' You'll see this:

' ...
' --------------020807050607070004010609
' Content-Type: image/jpeg; name="orange_starfish.jpg"
' Content-Transfer-Encoding: base64
' Content-Disposition: attachment; filename="orange_starfish.jpg"
' 
' ...
' --------------020807050607070004010609
' Content-Type: application/pdf; name="tuna_fishing.pdf"
' Content-Transfer-Encoding: base64
' Content-Disposition: attachment; filename="tuna_fishing.pdf"
' ...


' Send the email with the updated filenames..
success = mailman.SendEmail(email)
If (success <> True) Then
    Debug.WriteLine(mailman.LastErrorText)
    Exit Sub
End If


success = mailman.CloseSmtpConnection()
If (success <> True) Then
    Debug.WriteLine("Connection to SMTP server not closed cleanly.")
End If


Debug.WriteLine("Mail with attachments sent!")