private async Task <SendEmailResponse> SendEmailAsync(EmailParticipant sender, ICollection <EmailParticipant> to,
ICollection <EmailParticipant> cc, ICollection <EmailParticipant> bcc, string subject, string content,
bool isHtml, IEnumerable <EmailAttachment> attachments)
{
try
{
using (var client = new SmtpClient())
{
client.Connect(_settings.Host, _settings.Port, _settings.IsSsl);
// Note: since we don't have an OAuth2 token, disable
// the XOAUTH2 authentication mechanism.
client.AuthenticationMechanisms.Remove("XOAUTH2");
// Note: only needed if the SMTP server requires authentication
var username = _settings.Username;
var password = _settings.Password;
if (!string.IsNullOrWhiteSpace(username) && !string.IsNullOrWhiteSpace(password))
{
client.Authenticate(username, password);
}
var message = ComposeEmail(sender, to, cc, bcc, subject, content, isHtml, attachments);
await client.SendAsync(message);
client.Disconnect(true);
return(new SendEmailResponse {
Result = ProcessResultType.Ok
});
}
}
catch (Exception ex)
{
return(new SendEmailResponse {
Result = ex
});
}
}
private static MimeMessage ComposeEmail(EmailParticipant sender, IEnumerable <EmailParticipant> to,
ICollection <EmailParticipant> cc, ICollection <EmailParticipant> bcc, string subject, string content,
bool isHtml = false, IEnumerable <EmailAttachment> attachments = null)
{
var message = new MimeMessage(
new[] { new MailboxAddress(sender.Name, sender.EmailAddress) },
to.Where(x => !string.IsNullOrWhiteSpace(x.EmailAddress))
.Select(x => new MailboxAddress(x.Name, x.EmailAddress))
.ToList(), //key is name, value is address
subject,
null
);
if (cc != null && cc.Any())
{
cc.ToList()
.ForEach(x =>
{
if (!string.IsNullOrWhiteSpace(x.EmailAddress))
{
message.Cc.Add(new MailboxAddress(x.Name, x.EmailAddress));
}
}); //key is name, value is address
}
if (bcc != null && bcc.Any())
{
bcc.ToList()
.ForEach(x =>
{
if (!string.IsNullOrWhiteSpace(x.EmailAddress))
{
message.Bcc.Add(new MailboxAddress(x.Name, x.EmailAddress));
}
}); //key is name, value is address
}
var body = new TextPart(isHtml ? "html" : "plain")
{
Text = content
};
var attachmentList = attachments?.ToList();
if (attachmentList != null && attachmentList.Any())
{
var multipart = new Multipart("mixed")
{
body
};
attachmentList.ForEach(c =>
{
var mimetype = DetectFileMimeType(c.FileName);
var attachment = new MimePart(mimetype.Split('/')[0], mimetype.Split('/')[1])
{
ContentObject =
new ContentObject(File.OpenRead(c.FileName), ContentEncoding.Default),
ContentDisposition = new ContentDisposition(ContentDisposition.Attachment),
ContentTransferEncoding = ContentEncoding.Base64,
FileName = Path.GetFileName(c.FileName)
};
multipart.Add(attachment);
});
message.Body = multipart;
}
else
{
message.Body = body;
}
return(message);
}
public async Task <SendEmailResponse> SendEmailAsync(EmailParticipant sender, IEnumerable <EmailParticipant> to,
IEnumerable <EmailParticipant> cc, IEnumerable <EmailParticipant> bcc, int interval, string subject,
string content, bool isHtml, IEnumerable <EmailAttachment> attachments,
IProgressReporter <SendEmailProgress> progressReporter)
{
var attachmentList = attachments.ToList();
var toList = to.ToList();
var toCount = toList.Count;
var ccList = cc.ToList();
var bccList = bcc.ToList();
if (_emailSettings.DumpToFilesOnly)
{
var filePath = Path.Combine(_emailSettings.DumpFileFolder,
DateTimeOffset.UtcNow.ToString("yyyy-MM-dd HHmmss") + subject);
var dumpContentBuilder = new StringBuilder();
dumpContentBuilder.AppendLine(subject);
dumpContentBuilder.AppendLine();
if (!string.IsNullOrWhiteSpace(sender?.EmailAddress))
{
dumpContentBuilder.AppendLine("From: " + sender.EmailAddress);
}
dumpContentBuilder.AppendLine();
foreach (var ccItem in ccList)
{
dumpContentBuilder.AppendLine("To: " + ccItem.EmailAddress);
}
dumpContentBuilder.AppendLine();
dumpContentBuilder.AppendLine(content);
File.WriteAllText(filePath, dumpContentBuilder.ToString());
return(new SendEmailResponse().WithProcessResult(ProcessResultType.Ok));
}
progressReporter?.SetTotal(toCount, null, $"Sending {toCount} email(s) to SMTP server...",
DateTimeOffset.UtcNow);
if (interval <= 0) //don't need to wait, just send them all in one go
{
var res = await SendEmailAsync(sender, toList, ccList, bccList, subject, content, isHtml,
attachmentList);
progressReporter?.Report(toList.Count, null, $"Sent {toCount} email(s) to SMTP server.",
DateTimeOffset.UtcNow);
return(res);
}
else //send email at given interval
{
var subreslst = new List <SendEmailResponse>();
foreach (var recipient in toList)
{
var subres = await SendEmailAsync(sender,
new List <EmailParticipant> {
recipient
}, ccList, bccList, subject, content, isHtml,
attachmentList);
subreslst.Add(subres);
progressReporter?.Report(1, null,
$"Sent email to SMTP server: {recipient.EmailAddress} ({recipient.Name})",
DateTimeOffset.UtcNow);
await Task.Delay(interval);
}
var res = CombineMultipleSendEmailResponses(subreslst);
return(res);
}
}