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VB6, VBA Example In general, we send email via specified SMTP server. How does the specified SMTP server know what address this email should be sent to? The answer is... it queries MX record of recipient's domain via DNS lookup. It then forwards this email to the SMTP server queried from DNS server. If recipient's server doesn't work fine, sender's SMTP server will send a failure-delivery report to the sender telling it failed to send out the email.
How does EASendMail SMTP component work with "Send email directly"? Firstly, it queries MX record for recipient address from DNS, then sends email to recipient's email server directly. In short, if no SMTP server is specified in the code, EASendMail will send email to recipient directly. Since querying DNS server consumes CPU time and networking resource, the performance of "Send email directly" is lower than sending email with specified SMTP server. Moreover, nowadays more and more SMTP servers block email sent from dynamic IP address, so we don't recommend you to use "Direct Send Email" except you have a static IP address or you encounter problem with your ISP SMTP server.
' The following example codes demonstrate sending email message using MX DNS lookup
' To get full sample projects, please download and install EASendMail on your machine.
' To run it correctly, please change SMTP server, user, password, sender, recipient value to yours
Code:
Private Sub btnSendMail_Click()
Dim oSmtp As New EASendMailObjLib.Mail
oSmtp.LicenseCode = "TryIt"
' Set your sender email address
oSmtp.FromAddr = "test@emailarchitect.net"
' Add recipient email address
oSmtp.AddRecipientEx "support@emailarchitect.net", 0
' Set email subject
oSmtp.Subject = "simple email from VB 6.0 project"
' Set email body
oSmtp.BodyText = "this is a test email sent from VB 6.0 project, do not reply"
' Do not set SMTP server address
oSmtp.ServerAddr = ""
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
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