Tip 14 : Solve SmtpClient issues of delayed email and high CPU usage
1. It is quite straightforward using SmtpClient class to send out an email
2. However, when you step through the above code executing smtpClient.Send(), you will notice about 2 minutes delay in receiving the email.
3. My first try to solve the issue of delayed email is to set MaxIdleTime=1
4. The first try solves the issue of delayed email very well but introduces another issue: high CPU usage. The CPU usage of my deployed windows service is consistently at 50%, which is much higher than the expected near-zero CPU usage.
5. The second try is to set MaxIdleTime=2, which solves the both issues.
