SMTP using HTTP Proxy

Demonstrates how to communicate with an SMTP server via an HTTP proxy.

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'  The mailman object is used for sending and receiving email.
Dim mailman As New ChilkatMailMan2

'  Any string argument automatically begins the 30-day trial.
Dim success As Long
success = mailman.UnlockComponent("30-day trial")
If (success <> 1) Then
    MsgBox "Component unlock failed"
    Exit Sub
End If

'  To connect through an HTTP proxy, set the HttpProxyHostname
'  and HttpProxyPort properties to the hostname (or IP address)
'  and port of the HTTP proxy.  Typical port numbers used by
'  HTTP proxy servers are 3128 and 8080.
mailman.HttpProxyHostname = "www.my-http-proxy.com"
mailman.HttpProxyPort = 3128

'  Important:  Your HTTP proxy server must allow non-HTTP
'  traffic to pass.  Otherwise this does not work.

'  Set the SMTP server.
mailman.SmtpHost = "smtp.chilkatsoft.com"

'  Set the SMTP login/password (if required)
mailman.SmtpUsername = "myUsername"
mailman.SmtpPassword = "myPassword"

'  Create a new email object
Dim email As New ChilkatEmail2

email.Subject = "This is a test"
email.Body = "This is a test"
email.From = "Chilkat Support <support@chilkatsoft.com>"
email.AddTo "Chilkat Admin","admin@chilkatsoft.com"

'  Call SendEmail to connect to the SMTP server via the HTTP proxy and send.
'  The connection (i.e. session) to the SMTP server remains
'  open so that subsequent SendEmail calls may use the
'  same connection.
success = mailman.SendEmail(email)
If (success <> 1) Then
    MsgBox mailman.LastErrorText
    Exit Sub
End If

'  Some SMTP servers do not actually send the email until
'  the connection is closed.  In these cases, it is necessary to
'  call CloseSmtpConnection for the mail to be  sent.
'  Most SMTP servers send the email immediately, and it is
'  not required to close the connection.  We'll close it here
'  for the example:
success = mailman.CloseSmtpConnection()
If (success <> 1) Then
    MsgBox "Connection to SMTP server not closed cleanly."
End If

MsgBox "Mail Sent!"