Example of how we would change Watchdog to use SendGrid

gistfile1.vb

' Each worker currently uses Net.Mail.SmtpClient to drop the message into the IIS outgoing mail directory.
' For SendGrid we would change the code below as follows:

If oSmtpClient Is Nothing Then
  oSmtpClient = New System.Net.Mail.SmtpClient
  oSmtpClient.DeliveryMethod = Net.Mail.SmtpDeliveryMethod.PickupDirectoryFromIis
End If
oSmtpClient.Send(oEmail)

' With SendGrid this would become:
If oSmtpClient Is Nothing Then
  oSmtpClient = New System.Net.Mail.SmtpClient
  oSmtpClient.Host = "smtp.sendgrid.net"
  oSmtpClient.DeliveryMethod = Net.Mail.SmtpDeliveryMethod.Network
  oSmtpClient.UseDefaultCredentials = false
  oSmtpClient.Port = 25
  oSmtpClient.Credentials = new System.Net.NetworkCredential("name@example.com", "password")
End If
oSmtpClient.Send(oEmail)