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SMTP: Simple Mail Testing Program

Submitted on: 1/1/2015 2:01:00 PM
By: Brian Anderson (from psc cd)  
Level: Not Given
User Rating: By 2 Users
Compatibility: VB 5.0, VB 6.0
Views: 2654
     Allows sending of e-mail (SMTP) directly from a VB app using Winsock, WITH OUT having to buy an expensive add on componet

Windows API/Global Declarations:

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'Windows API/Global Declarations for :SMTP: Simple Mail Testing Program
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' Name: SMTP: Simple Mail Testing Program
' Description:Allows sending of e-mail (SMTP) directly from a VB app using Winsock, WITH OUT having to buy an expensive add on componet
' By: Brian Anderson (from psc cd)
' Inputs:Requires: Server Address (Name or IP), Senders & Recipeient's Names, Sender & Recipient E-Mail address, Body of message
' Returns:Nothing really, does give status on sending operation
' Assumes:Very straight forward. Makes sending mail from a VB program EASY!
' Side Effects:NONE!

Dim Response As String, Reply As Integer, DateNow As String
Dim 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"
 first = "mail from:" + Chr(32) + FromEmailAddress + vbCrLf ' Get who's sending E-Mail address
 Second = "rcpt to:" + Chr(32) + ToEmailAddress + vbCrLf ' Get who mail is going to
 Third = "Date:" + Chr(32) + DateNow + vbCrLf ' Date when being sent
 Fourth = "From:" + Chr(32) + FromName + vbCrLf ' Who's Sending
 Fifth = "To:" + Chr(32) + ToNametxt + vbCrLf ' Who it going to
 Sixth = "Subject:" + Chr(32) + EmailSubject + vbCrLf ' Subject of E-Mail
 Seventh = EmailBodyOfMessage + vbCrLf ' E-mail message body
 Ninth = "X-Mailer: EBT Reporter v 2.x" + vbCrLf ' What program sent the e-mail, customize this
 Eighth = Fourth + Third + Ninth + Fifth + Sixth ' Combine for proper SMTP sending
 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...."
 Winsock1.SendData ("HELO yourdomain.com" + vbCrLf)
 WaitFor ("250")
 StatusTxt.Caption = "Connected"
 Winsock1.SendData (first)
 StatusTxt.Caption = "Sending Message"
 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"
 WaitFor ("221")
 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
 While Left(Response, 3) <> ResponseCode
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
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"
End Sub
Private Sub Command2_Click()
End Sub
Private Sub Form_Load()
End Sub
Private Sub Winsock1_DataArrival(ByVal bytesTotal As Long)
 Winsock1.GetData Response ' Check for incoming response *IMPORTANT*
End Sub

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