SMTP settings in appSettings.json in dotnet core 2.0

Question

In Asp.net, I can normally send emails using the following code:

using (var smtp = new SmtpClient())
{
    await smtp.SendMailAsync(mailMessage);
}

With the smtp settings being provided in the web.config, which are then automatically used by the SmtpClient. The web.config config section looks like:

<mailSettings>
    <smtp deliveryMethod="Network">
      <network host="myHost" port="25" userName="myUsername" password="myPassword" defaultCredentials="false" />
    </smtp>
</mailSettings>

Is it possible to have config in the appSettings.json file in a dotnet core 2.0 application, which can then be used by the SmtpClient, similar to Asp.net?

Answer 1

If you insist on using System.Net.Mail.SmtpClient, you can do it this way:

appsettings.json

{
  "Smtp": {
    "Server": "mail.whatever.com",
    "Port": 25,
    "FromAddress": "[email protected]"
  },
}

Code:

    public async Task SendEmailAsync(string email, string subject, string htmlMessage)
    {
        MailMessage message = new MailMessage();
        message.Subject = subject;
        message.Body = htmlMessage;
        message.IsBodyHtml = true;
        message.To.Add(email);

        string host = _config.GetValue<string>("Smtp:Server", "defaultmailserver");
        int port = _config.GetValue<int>("Smtp:Port", 25);
        string fromAddress = _config.GetValue<string>("Smtp:FromAddress", "defaultfromaddress");

        message.From = new MailAddress(fromAddress);

        using (var smtpClient = new SmtpClient(host, port))
        {
            await smtpClient.SendMailAsync(message);
        }
    }

Where _config is an implementation of IConfiguration which is injected into the class in which the SendEmailAsync method resides.

However, since it's obsolete, it might be better to explore other methods as mentioned in the comments above.