Отправка письма с использованием DNS
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Иногда отправка электронных писем с использованием SMTP-сервера невозможна для требований проекта. Мы можем захотеть использовать MX-запись доменного имени получателя. Следующий фрагмент кода демонстрирует, как отправлять электронные письма, используя почтовые серверы домена получателя.
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// For complete examples and data files, please go to https://github.com/aspose-email/Aspose.Email-for-.NET | |
static void Main(string[] args) | |
{ | |
try | |
{ | |
MailMessage msg = new MailMessage("add1@domain.com", "add1@domain.com", "test", "this is a test"); | |
msg.CC.Add(new MailAddress("add2@domain.com", "CC Display Name")); | |
DnsSendMessage(msg); | |
} | |
catch (Exception e) | |
{ | |
Console.WriteLine(e.Message); | |
} | |
} | |
private static void DnsSendMessage(MailMessage msg) | |
{ | |
// Get all the recipients in to, cc and bcc in one collection | |
MailAddressCollection addresses = new MailAddressCollection(); | |
foreach (MailAddress to in msg.To) | |
{ | |
addresses.Add(to); | |
} | |
foreach (MailAddress cc in msg.CC) | |
{ | |
addresses.Add(cc); | |
} | |
foreach (MailAddress bcc in msg.Bcc) | |
{ | |
addresses.Add(bcc); | |
} | |
// Send mail using DNS to each address | |
foreach (MailAddress addr in addresses) | |
{ | |
// Find mail exchange servers with the help of DnsClient | |
DnsClient dnsClient = new DnsClient(); | |
Question mxQuestion = new Question(addr.Host, QueryType.MX); | |
if (dnsClient.Resolve(mxQuestion)) | |
{ | |
// Try to send a message | |
foreach (ResourceRecord record in dnsClient.ReceivedMessage.Answers) | |
{ | |
MXResourceRecord cnRecord = record as MXResourceRecord; | |
if (cnRecord != null) | |
{ | |
try | |
{ | |
// Send message | |
SmtpClient client = new SmtpClient(); | |
client.AuthenticationMethod = SmtpAuthentication.None; | |
client.Host = cnRecord.ExchangeName; | |
client.Port = 25; | |
client.Send(msg); | |
Console.WriteLine("Mail sent to " + addr.Address); | |
} | |
catch (SmtpException e) | |
{ | |
Console.WriteLine(cnRecord.ExchangeName + ": " + e.Message + Environment.NewLine); | |
continue; | |
} | |
} | |
} | |
} | |
} | |
} |