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Asked: 2026-05-16T18:08:50+00:00

Why does this timeout? Dim s As New SmtpClient s.Host = smtp.gmail.com s.Port =

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Why does this timeout?

Dim s As New SmtpClient
s.Host = "smtp.gmail.com"
s.Port = 465
s.EnableSsl = True
s.Timeout = 5000
s.Credentials = New NetworkCredential("my.name@gmail.com", "mypassword")

Dim m As New MailMessage
m.To.Add("my.name@gmail.com")
m.From = New MailAddress("my.name@gmail.com")
m.Body = "Test Message"
m.Subject = "Test Subject"
s.Send(m)

These settings come straight from my Outlook Express test setup, and it can send fine.

Set really long timeout = does nothing

Change port numbers to 587 or 25 = does nothing

One thought: Outlook Express has a “My server requires authentication” option, which I couldn’t see an obvious equivalent for with SmtpClient. Could it be related to that?

Thanks in advance

Dave

–Trindaz on Fedang #vb.net-smtp

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1 Answer

  1. Editorial Team

    Edit: You might need to add the following line: s.UseDefaultCredentials = False before the line starting with s.Credentials...

    Do you have a firewall or some kind of anti-virus program running that might be blocking the connections?

    A good place to start is to just do a simple connect from the command line.

    telnet smtp.gmail.com 465

    Note, depending on Windows version you might have to enable the telnet client first, see this link for details.

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