ROLAC/API/ROLAC.API/Services/Notifications/MailKitSmtpDispatcher.cs

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

namespace ROLAC.API.Services.Notifications;

/// <summary>Sends a single email via MailKit using the configured SMTP server.</summary>
public sealed class MailKitSmtpDispatcher : ISmtpDispatcher
{
    private readonly SmtpOptions _options;

    public MailKitSmtpDispatcher(IOptions<SmtpOptions> options) => _options = options.Value;

    public async Task SendAsync(OutboundEmail email, CancellationToken ct = default)
    {
        var message = new MimeMessage();
        message.From.Add(new MailboxAddress(_options.FromName, _options.FromAddress));
        message.To.Add(MailboxAddress.Parse(email.ToAddress));
        message.Subject = email.Subject;

        var builder = new BodyBuilder { HtmlBody = email.HtmlBody };
        foreach (var attachment in email.Attachments)
        {
            builder.Attachments.Add(
                attachment.FileName, attachment.Content, ContentType.Parse(attachment.ContentType));
        }
        message.Body = builder.ToMessageBody();

        using var client = new SmtpClient();
        var socketOptions = _options.UseSsl ? SecureSocketOptions.StartTls : SecureSocketOptions.Auto;
        await client.ConnectAsync(_options.Host, _options.Port, socketOptions, ct);
        if (!string.IsNullOrEmpty(_options.User))
            await client.AuthenticateAsync(_options.User, _options.Password, ct);
        await client.SendAsync(message, ct);
        await client.DisconnectAsync(true, ct);
    }
}