问题
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
回答1:
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.
回答2:
You have to go into your gmail account and turn on access for less secure apps and change the port to 587
来源：https://stackoverflow.com/questions/3615674/vb-net-sending-email-using-gmail-account