Send ASP.NET mail through SecureSMTP

Set up in under five minutes

Same flow for every integration: account → credentials → paste into ASP.NET → test send.

1. 1

   Create a free SecureSMTP account

   Sign up at securessmtp.com/signup. Free tier covers 100 emails/month — no card required.

2. 2

   Create an API key

   Dashboard → Settings → API keys → Create. Store it in your environment (e.g. SECURESMTP_API_KEY in .env). Never commit it.

3. 3

   Install or import the SDK

   dotnet add package SecureSMTP.Net · or use System.Net.Mail.SmtpClient pointed at smtp.securessmtp.com.

4. 4

   Make your first send

   Copy the snippet below into a server-side endpoint or background job. Replace the to/subject/html with your own values.

5. 5

   Test, then ship

   Trigger your endpoint in dev. Check the dashboard activity feed to confirm the send. Ship to prod — same code, no config swap.

// Program.cs
using System.Net.Mail;
var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();

app.MapPost("/api/contact", async (Contact data) => {
    using var smtp = new SmtpClient("smtp.securessmtp.com", 587);
    smtp.Credentials = new System.Net.NetworkCredential(
        Environment.GetEnvironmentVariable("SECURESMTP_USER"),
        Environment.GetEnvironmentVariable("SECURESMTP_PASS"));
    smtp.EnableSsl = true;
    var msg = new MailMessage("site@yourdomain.com", "you@yourdomain.com",
                              "Contact", data.Message);
    await smtp.SendMailAsync(msg);
    return Results.Ok();
});

record Contact(string Message);

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