Entity Framework - e-mail processing

// *** Send all e-mails according to data in database ***
[HttpPost("[action]")]
public ActionResult SendAllNotifications()
{
    var client = new SmtpClient("127.0.0.1", 25);
    var sender = "admin@my-cool-webapi.com";

    try
    {
        var unsentNotifications =
            _dbContext.Notifications.Where(
                x => !x.SentAt.HasValue);

        foreach (var notification in unsentNotifications)
        {
            try
            {
                var mail = new MailMessage(
                    from: new MailAddress(sender),
                    to: new MailAddress(notification.Receiver));

                mail.Subject = notification.Subject;
                mail.Body = notification.Body;

                client.Send(mail);

                notification.SentAt = DateTime.UtcNow;
                _dbContext.SaveChanges();

            }
            catch (Exception)
            {
                // Black hole for notification is bad handling :(
            }
        }

        return Ok();
    }
    catch (Exception)
    {
        return StatusCode(StatusCodes.Status500InternalServerError);
    }
}

// *** Model to send batch of e-mails according to data in database
public partial class SendNotificationsResponse
{
    public int SuccessCount { get; set; }
    public int FailCount { get; set; }

}

// *** Send batch of e-mails according to data in database ***
[HttpPost("[action]/{count}")]
public ActionResult<SendNotificationsResponse> SendNotificationBatch(int? count)
{
    var client = new SmtpClient("127.0.0.1", 25);
    var sender = "admin@my-cool-webapi.com";

    try
    {
        var unsentNotifications =
            _dbContext.Notifications
                .Where(x => !x.SentAt.HasValue)
                .OrderBy(x => x.CreatedAt)
                .AsQueryable();

        if(count.HasValue)
            unsentNotifications = unsentNotifications.Take(count.Value);

        int sendSuccessCount = 0;
        int sendFailCount = 0;
        foreach (var notification in unsentNotifications)
        {
            try
            {
                var mail = new MailMessage(
                    from: new MailAddress(sender),
                    to: new MailAddress(notification.Receiver));

                mail.Subject = notification.Subject;
                mail.Body = notification.Body;

                client.Send(mail);

                notification.SentAt = DateTime.UtcNow;
                _dbContext.SaveChanges();

                sendSuccessCount++;
            }
            catch (Exception)
            {
                sendFailCount++;
            }
        }

        return Ok(new SendNotificationsResponse
        {
            SuccessCount = sendSuccessCount,
            FailCount = sendFailCount
        });
    }
    catch (Exception)
    {
        return StatusCode(StatusCodes.Status500InternalServerError);
    }
}