The following vb6 example codes demonstrate how to send email over TLS on 25 or 587 SMTP port.
SSL and TLS
SSL connection encrypts data between the SMTP component and SMTP server to protects user, password and email content in TCP/IP level. Now this technology is commonly used and many SMTP servers are deployed with SSL such as Gmail, Yahoo and Hotmail. There are two ways to deploy SSL on SMTP server:
Explicit SSL (TLS)
Using STARTTLS command to switch SSL channel on normal SMTP port (25 or 587);
Deploying SSL on another port (465 or other port, you may query it from your server administrator
EASendMail SMTP component supports both ways. The connection can be specified by Mail.ConnectType property. Please see the following example code.
TLS is the successor of SSL, EASendMail supports SSL 3.0/TLS1.0 - 1.2 very well. In EASendMail, ConnectSTARTTLS doesn’t mean TLS encryption, it means STARTTLS command in SMTP protocol.
You don’t have to set any property to enable TLS 1.2 encryption. If your server requires TLS 1.2 encryption, TLS 1.2 encryption is used automatically.
To enable TLS 1.2 on some legacy systems, you have to install required update/packages:
EASendMail is a SMTP component which supports all operations of SMTP/ESMTP protocols (RFC 821, RFC 822, RFC 2554). Before you can use the following example codes, you should download the EASendMail Installer and install it on your machine at first.
To use EASendMail SMTP ActiveX Object in your project, the first step is “Add reference
of EASendMail to your project”. Please select menu ->
EASendMailObj ActiveX Object, click
OK, the reference will be added
to current project, and you can start to use it to send email in your project.
The following example codes demonstrate how to send email over TLS connection on 25 or 587 port.
In order to run it correctly, please change
recipient value to yours.
To get full sample projects, please download and install EASendMail on your machine.
Const ConnectNormal = 0 Const ConnectSSLAuto = 1 Const ConnectSTARTTLS = 2 Const ConnectDirectSSL = 3 Const ConnectTryTLS = 4 Private Sub btnSendMail_Click() Dim oSmtp As New EASendMailObjLib.Mail oSmtp.LicenseCode = "TryIt" ' Set your sender email address oSmtp.FromAddr = "email@example.com" ' Add recipient email address oSmtp.AddRecipientEx "firstname.lastname@example.org", 0 ' Set email subject oSmtp.Subject = "simple email from VB 6.0 over TLS 25 port" ' Set email body oSmtp.BodyText = "this is a test email sent from VB 6.0 project, do not reply" ' Your SMTP server address oSmtp.ServerAddr = "smtp.emailarchitect.net" ' User and password for ESMTP authentication, if your server doesn't require ' User authentication, please remove the following codes. oSmtp.UserName = "email@example.com" oSmtp.Password = "testpassword" ' Set 25 or 587 SMTP port oSmtp.ServerPort = 25 ' Enable TLS/SSL connection oSmtp.ConnectType = ConnectSSLAuto MsgBox "start to send email ..." If oSmtp.SendMail() = 0 Then MsgBox "email was sent successfully!" Else MsgBox "failed to send email with the following error:" & oSmtp.GetLastErrDescription() End If End Sub
Seperate builds of run-time dll for 32 and x64 platform
|Installation Path\Lib\native\x86\EASendMailObj.dll||32 bit|
|Installation Path\Lib\native\x64\EASendMailObj.dll||64 bit|
For VB6, C++, Delphi or other standard exe application, you can distribute EASendMailObj.dll with your application to target machine without COM-registration and installer. To learn more detail, please have a look at Registration-free COM with Manifest File.
For ASP, VBScript, VBA, MS SQL Stored Procedure, you need to install EASendMail on target machine by EASendMail installer, both 32bit/x64 DLL are installed and registered.