The following vb6 example codes demonstrate how to send email using Gmail SMTP server.
Gmail SMTP Server
Gmail SMTP server address is
smtp.gmail.com. It requires implicit SSL or explicit
SSL (TLS) connection, and you should use your Gmail email address as the user name
for ESMTP authentication.
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 sending email using Gmail SMTP server.
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.
Another way is Gmail OAUH, please see Gmail SMTP OAUTH section.
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 Gmail email address oSmtp.FromAddr = "firstname.lastname@example.org" ' Add recipient email address oSmtp.AddRecipientEx "email@example.com", 0 ' Set email subject oSmtp.Subject = "test email from gmail account" ' Set email body oSmtp.BodyText = "this is a test email sent from VB 6.0 project with gmail" ' Gmail SMTP server address oSmtp.ServerAddr = "smtp.gmail.com" ' If you want to use direct SSL 465 port, ' Please add this line, otherwise TLS will be used. ' oSmtp.ServerPort = 465 ' set 25 or 587 port oSmtp.ServerPort = 587 ' detect SSL/TLS automatically oSmtp.ConnectType = ConnectSSLAuto ' Gmail user authentication should use your ' Gmail email address as the user name. ' For example: your email is "firstname.lastname@example.org", then the user should be "email@example.com" oSmtp.UserName = "firstname.lastname@example.org" oSmtp.Password = "yourpassword" 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
The Gmail IMAP and SMTP servers have been extended to support authorization via the industry-standard OAuth 2.0 protocol. Using OAUTH protocol, user can do authentication by Gmail Web OAuth instead of inputting user and password directly in application. This way is more secure, but a little bit complex.
TLS is the successor of SSL, more and more SMTP servers require
TLS 1.2 encryption now.
If your operating system is
Windows XP/Vista/Windows 7/Windows 2003/2008/2008 R2/2012/2012 R2, you need to
enable TLS 1.2 protocol in your operating system like this:
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.