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我试图通过Outlook 365发送电子邮件。我收到以下错误消息。 SMTP错误:[MustIssueStartTlsFirst] 消息:SMTP服务器需要安全连接或客户端未通过身份验证。使用Outlook 365发送邮件
我的代码:
System.Net.NetworkCredential cred = new System.Net.NetworkCredential(mailInfo.FromAddr, mailInfo.Password);
SmtpClient mailClient = new SmtpClient(mailInfo.Server) {
Port = mailInfo.Port,
EnableSsl = true, //mailInfo.SSL,
DeliveryMethod = SmtpDeliveryMethod.Network,
UseDefaultCredentials = false,
Credentials = cred,
TargetName = "STARTTLS/smtp.office365.com"
};
MailMessage message = new MailMessage {
From = new MailAddress(mailInfo.FromAddr, mailInfo.FromName),
Subject = "Manifest Processor Shipment Report - Manifest: " + shipment.ManifestNumber,
Body = BuildManifestEmailBody(shipment),
Priority = MailPriority.High,
IsBodyHtml = true
};
什么是奇怪,我有一个运行,使用相同的代码一个小的测试程序。