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This is my SMTP settings in App.Config: <system.net> <mailSettings> <smtp from="Reminder &lt;reminder@myserver.com&gt;"> <network host="mail.myserver.net" port="587" password="my password" userName="reminder@myserver.com" enableSsl="true"/> </smtp> </mailSettings> </system.net> And this is how I'm sending the emails: message.SubjectEncoding = System.Text.Encoding.UTF8; message.BodyEncoding = System.Text.Encoding.UTF8; smtpClient.Send(message); this is working ! but the only problem is, my emails are going to spam folder and that's because they are missing Message-Id in their header. I use the same account in Thunderbird, when I send emails using thunderbird the Message-Id is added to my emails but it's not happening for the emails that are sent from my application. I can add the header manually with something like : message.Headers.Add("Message-Id","<3BD50098E401463AA228377848493927-1>"); But this Id is not a valid message-id and I will still get negative spam score for it. Any idea why this is happening ? This is what I have in Thunderbird: host: mail.korax.net / authentication: normal password / port: 587 / security: STARTTLS

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