/// <summary>
/// Sends the emails to all subscribers
/// </summary>
private void StartSend()
{
bool lastItem = false;
int numberOfMailServerErrors = 0;
SmtpClient smtp = new SmtpClient();
if (!String.IsNullOrEmpty(EmailServer))
{
smtp.Host = EmailServer;
}
else if (String.IsNullOrEmpty(smtp.Host))
{
smtp.DeliveryMethod = SmtpDeliveryMethod.PickupDirectoryFromIis;
}
try
{
// send the emails
for (; ;)
{
// make local copies of the message body so we don't get a race condition on the instance variables
string htmlBodyCopy = HtmlBody;
string plainTextBodyCopy = PlainTextBody;
Lock.AcquireWriterLock(Timeout.Infinite);
if (Subscribers.Count == 0 || MailServerDown)
{
Lock.ReleaseWriterLock();
break;
}
SubscriberInfo subscriber = Subscribers.Dequeue();
if (Subscribers.Count == 0)
{
lastItem = true;
}
Lock.ReleaseWriterLock();
MailMessage mail = new MailMessage();
mail.From = new MailAddress(FromEmail);
mail.To.Add(subscriber.Email);
mail.Subject = Subject;
if (Attachments != null)
{
foreach (Attachment att in Attachments)
{
mail.Attachments.Add(att);
}
}
if (subscriber.Replacements != null && subscriber.Replacements.Count > 0)
{
foreach (string key in subscriber.Replacements.Keys)
{
if (!string.IsNullOrEmpty(key) && subscriber.Replacements[key] != null)
{
htmlBodyCopy = htmlBodyCopy.Replace(key, subscriber.Replacements[key].ToString());
plainTextBodyCopy = plainTextBodyCopy.Replace(key, subscriber.Replacements[key].ToString());
}
}
}
switch (subscriber.SubscriptionType)
{
case SubscriptionType.Html:
mail.IsBodyHtml = true;
mail.Body = htmlBodyCopy;
break;
case SubscriptionType.PlainText:
mail.Body = plainTextBodyCopy;
break;
case SubscriptionType.MultiPart:
AlternateView textView = AlternateView.CreateAlternateViewFromString(plainTextBodyCopy, null, "text/plain");
textView.TransferEncoding = TransferEncoding.SevenBit;
AlternateView htmlView = AlternateView.CreateAlternateViewFromString(htmlBodyCopy, null, "text/html");
htmlView.TransferEncoding = TransferEncoding.SevenBit;
mail.AlternateViews.Add(textView);
mail.AlternateViews.Add(htmlView);
break;
default:
mail.Body = htmlBodyCopy;
break;
}
try
{
smtp.Send(mail);
Lock.AcquireWriterLock(Timeout.Infinite);
DataRow dr = newsletterActions.NewRow();
dr["MailoutID"] = MailoutID;
dr["Timestamp"] = DateTime.UtcNow;
dr["IPAddress"] = IPAddress;
dr["Email"] = subscriber.Email;
dr["SubscriberID"] = subscriber.SubscriberID;
dr["NewsletterActionTypeID"] = newsletterSendTypeID;
newsletterActions.Rows.Add(dr);
Lock.ReleaseWriterLock();
if (lastItem)
{
allThreadsFinished = true;
}
}
catch (SmtpException e)
{
mailServerError = true;
numberOfMailServerErrors++;
if (numberOfMailServerErrors > 2) //If the thread fails at the mail server 3 times in a row (thats 2 minutes of failure) assume the server is down and stop execution
{
MailServerDown = true;
}
Lock.AcquireWriterLock(Timeout.Infinite);
NotSentMails++;
Lock.ReleaseWriterLock();
Helpers.LogException(e);
if (lastItem)
{
allThreadsFinished = true;
}
Thread.Sleep(30000);
}
}
}
catch (Exception e)
{
Helpers.LogException(e);
}
}