blazor-scm/Infrastructure/Email/Smtp/SmtpEmailSender.cs

using MailKit.Net.Smtp;
using MailKit.Security;
using Microsoft.Extensions.Options;
using MimeKit;

namespace Indotalent.Infrastructure.Email.Smtp;

public class SmtpEmailSender : IEmailSender
{
    private readonly SmtpSettingsModel _settings;

    public SmtpEmailSender(IOptions<EmailSettingsModel> emailOptions)
    {
        _settings = emailOptions.Value.Smtp;
    }

    public async Task SendEmailAsync(string email, string subject, string htmlMessage)
    {
        var message = new MimeMessage();

        message.From.Add(new MailboxAddress(_settings.FromName, _settings.FromAddress));

        message.To.Add(MailboxAddress.Parse(email));

        message.Subject = subject;

        var bodyBuilder = new BodyBuilder
        {
            HtmlBody = htmlMessage
        };
        message.Body = bodyBuilder.ToMessageBody();

        using var client = new SmtpClient();
        try
        {
            await client.ConnectAsync(_settings.Host, _settings.Port, SecureSocketOptions.Auto);

            if (!string.IsNullOrEmpty(_settings.UserName))
            {
                await client.AuthenticateAsync(_settings.UserName, _settings.Password);
            }

            await client.SendAsync(message);
        }
        catch (Exception ex)
        {
            throw new Exception($"Failed to send email via SMTP to {email} via {_settings.Host}. Error: {ex.Message}", ex);
        }
        finally
        {
            await client.DisconnectAsync(true);
        }
    }
}