SMTP error while sending a message through Gmail

Question

This is the error when i tried to test the following codes below:

ERROR --> Must issue a STARTTLS command first. 15sm458594bwz.12 (530).

Dim message As New MailMessage

    message.From = New MailAddressCollection("from@gmail.com")
    message.To = New MailAddressCollection("to@gmail.com")
    message.Subject = "This is a simple message"
    message.BodyText = "Hello, Joe!"
    message.BodyHtml = "Hello, <b>Joe</b>!"


Dim smtp As New Smtp

    smtp.Connect("smtp.gmail.com", 587)
    smtp.Send(message) <-- The error occurs when it reads this line of code**
    smtp.Disconnect()
    smtp.Dispose()

Answer 1

or how to enable SSL?

Answer 2

To enable the SMTP/SSL calling a different variant of a Connect method is needed.

smtp.Connect("smtp.gmail.com",587, Nothing, SmtpSecurity.Explicit)

Gmail also requires you to provide a valid username and password when sending email. The whole code for sending the email via smtp.gmail.com follows:

    Dim message As New MailMessage

    message.From = New MailAddressCollection("from@gmail.com")
    message.To = New MailAddressCollection("to@gmail.com")
    message.Subject = "This is a simple message"
    message.BodyText = "Hello, Joe!"
    message.BodyHtml = "Hello, <b>Joe</b>!"


    Dim smtp As New Smtp

    ''# connect using explicit SSL
    smtp.Connect("smtp.gmail.com", 587, Nothing, SmtpSecurity.Explicit)

    ''# authenticate
    smtp.Login("myaccount@googlemail.com", "mypassword")

    ''# send the message
    smtp.Send(message) 

    ''# cleanup
    smtp.Disconnect()
    smtp.Dispose()

Note that you have to reference the Rebex Secure Mail component when using the SMTP/SSL.

Answer 3

Thanks Martin!

Tried your suggestion and it works by using Rebex Secure Mail component!

Thank you very much.

Comments

Great. It's nice to know that you've got it working. If the answer works could you please mark my answers as the correct one by clicking on the check box icon left to the proposed answer? This would help future visitors find the working solution.

Answer 4

Thanks Martin! I will try your other suggestion