在VB6.0中使用Socket发送带SMTP认证的邮件

这个例子网上有很多版本，但是通常能发的，异常管理不是做的很好，这里的代码是我稍加整理的。包含了认证过程，我想现在SMTP一般都是要认证的吧。不要认证的只需把相应的行去掉即可。

代码如下：

Dim Response As String, Reply As Integer
Dim DateNow As String, first As String, Second As String, Third As String
Dim Fourth As String, Fifth As String, Sixth As String
Dim Seventh As String, Eighth As String
Dim Start As Single, Tmr As Single

Sub SendEmail(MailServerName As String, FromName As String, FromEmailAddress As String, ToName As String, ToEmailAddress As String, EmailSubject As String, EmailBodyOfMessage As String)
    Winsock1.LocalPort = 0  ' Must set local port to 0 (Zero) or
                            'you can only send 1 e-mail per program
                            'start

    If Winsock1.State = sckClosed Then 'Check to see if socet is closed
        DateNow = Format(Date, "Ddd") & ", " _
                & Format(Date, "dd Mmm YYYY") & " " _
                & Format(Time, "hh:mm:ss") & "" & " -0600"
       
        ' Get who's sending E-Mail address
        first = "mail from:" + Chr(32) + FromEmailAddress + vbCrLf
        ' Get who mail is going to
        Second = "rcpt to:" + Chr(32) + ToEmailAddress + vbCrLf
        ' Date when being sent
        Third = "Date:" + Chr(32) + DateNow + vbCrLf
        ' Who's Sending
        Fourth = "From:" + Chr(32) + FromName + vbCrLf
        ' Who it going to
        Fifth = "To:" + Chr(32) + ToNametxt + vbCrLf
        ' Subject of E-Mail
        Sixth = "Subject:" + Chr(32) + EmailSubject + vbCrLf
        ' E-mail message body
        Seventh = EmailBodyOfMessage + vbCrLf
        ' What program sent the e-mail, customize this
        Ninth = "X-Mailer: EBT Reporter v 2.x" + vbCrLf
        ' Combine for proper SMTP sending
        Eighth = Fourth + Third + Ninth + Fifth + Sixth
       
        Winsock1.Protocol = sckTCPProtocol ' Set protocol for sending
        Winsock1.RemoteHost = MailServerName ' Set the server address
        Winsock1.RemotePort = 25 ' Set the SMTP Port
        Winsock1.Connect ' Start connection
        WaitFor ("220")
        StatusTxt.Caption = "Connecting...."
        StatusTxt.Refresh
       
        Winsock1.SendData ("HELO xxx.gov.cn" + vbCrLf)
        WaitFor ("250")
        StatusTxt.Caption = "Connected"
        StatusTxt.Refresh
       
        Winsock1.SendData ("AUTH LOGIN" + vbCrLf)
        WaitFor ("334")
        StatusTxt.Caption = "Sending AUTH LOGIN"
        StatusTxt.Refresh
       
        Winsock1.SendData (Base64_Encode("[e-mail]") + vbCrLf)
        WaitFor ("334")
        StatusTxt.Caption = "Sending Username"
        StatusTxt.Refresh
       
        Winsock1.SendData (Base64_Encode("danny") + vbCrLf)
        WaitFor ("235")
        StatusTxt.Caption = "Sending Password"
        StatusTxt.Refresh
       
       
        Winsock1.SendData (first)
        StatusTxt.Caption = "Sending Message"
        StatusTxt.Refresh
        WaitFor ("250")
       
        Winsock1.SendData (Second)
        WaitFor ("250")
       
        Winsock1.SendData ("data" + vbCrLf)
        WaitFor ("354")
       
        Winsock1.SendData (Eighth + vbCrLf)
        Winsock1.SendData (Seventh + vbCrLf)
        Winsock1.SendData ("." + vbCrLf)
        WaitFor ("250")
       
        Winsock1.SendData ("quit" + vbCrLf)
        StatusTxt.Caption = "Disconnecting"
        StatusTxt.Refresh
        WaitFor ("221")
        Winsock1.Close
    Else
        MsgBox (Str(Winsock1.State))
    End If
End Sub

Sub WaitFor(ResponseCode As String)

    Start = Timer ' Time event so won't get stuck in loop

    While Len(Response) = 0
        Tmr = Start - Timer
        DoEvents ' Let System keep checking for incoming response **IMPORTANT**
            If Tmr > 50 Then ' Time in seconds to wait
                MsgBox "SMTP service error, timed out while waiting for response", 64, MsgTitle
                Exit Sub
            End If
        Wend

    While Left(Response, 3) <> ResponseCode
        DoEvents
            If Tmr > 50 Then
                MsgBox "SMTP service error, impromper response code. Code should have been: " + ResponseCode + " Code recieved: " + Response, 64, MsgTitle
                Exit Sub
            End If
    Wend
    Response = "" ' Sent response code to blank **IMPORTANT**
End Sub

Private Sub Command1_Click()
    SendEmail txtEmailServer.Text, txtFromName.Text, txtFromEmailAddress.Text, txtToEmailAddress.Text, txtToEmailAddress.Text, txtEmailSubject.Text, txtEmailBodyOfMessage.Text    'MsgBox ("Mail Sent")
    StatusTxt.Caption = "Mail Sent"
    StatusTxt.Refresh
    Beep
    Close
End Sub

Private Sub Winsock1_DataArrival(ByVal bytesTotal As Long)
    Winsock1.GetData Response ' Check for incoming response *IMPORTANT*
End Sub

Private Function Base64_Encode(strSource) As String 'base6加密算法
    Const BASE64_TABLE As String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
    Dim strTempLine As String
    Dim j As Integer
    For j = 1 To (Len(strSource) - Len(strSource) Mod 3) Step 3
        strTempLine = strTempLine + Mid(BASE64_TABLE, (Asc(Mid(strSource, j, 1)) / 4) + 1, 1)
        strTempLine = strTempLine + Mid(BASE64_TABLE, ((Asc(Mid(strSource, j, 1)) Mod 4) * 16 _
                      + Asc(Mid(strSource, j + 1, 1)) / 16) + 1, 1)
        strTempLine = strTempLine + Mid(BASE64_TABLE, ((Asc(Mid(strSource, j + 1, 1)) Mod 16) * 4 _
                      + Asc(Mid(strSource, j + 2, 1)) / 64) + 1, 1)
        strTempLine = strTempLine + Mid(BASE64_TABLE, (Asc(Mid(strSource, j + 2, 1)) Mod 64) + 1, 1)
    Next j
    If Not (Len(strSource) Mod 3) = 0 Then
         If (Len(strSource) Mod 3) = 2 Then
            strTempLine = strTempLine + Mid(BASE64_TABLE, (Asc(Mid(strSource, j, 1)) / 4) + 1, 1)
            strTempLine = strTempLine + Mid(BASE64_TABLE, (Asc(Mid(strSource, j, 1)) Mod 4) * 16 _
                      + Asc(Mid(strSource, j + 1, 1)) / 16 + 1, 1)
             strTempLine = strTempLine + Mid(BASE64_TABLE, (Asc(Mid(strSource, j + 1, 1)) Mod 16) * 4 + 1, 1)
            strTempLine = strTempLine & "="
        ElseIf (Len(strSource) Mod 3) = 1 Then
            strTempLine = strTempLine + Mid(BASE64_TABLE, Asc(Mid(strSource, j, 1)) / 4 + 1, 1)
            strTempLine = strTempLine + Mid(BASE64_TABLE, (Asc(Mid(strSource, j, 1)) Mod 4) * 16 + 1, 1)
             strTempLine = strTempLine & "=="
        End If
     End If
    Base64_Encode = strTempLine
End Function

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