Question

我的vb.net代码使用Mailkit通过我的ionos服务器发送电子邮件。

Dim cl As New SmtpClient

cl.ServerCertificateValidationCallback = AddressOf AcceptAllCertifications

cl.Connect(email_host, 25, MailKit.Security.SecureSocketOptions.None)

cl.Send(de_mimemessage)

代码正常运行，但是偶尔（也许每几百次）我在代码的连接部分收到以下错误：

需要验证

我该怎么做才能使此错误永远不会发生？

这是堆栈跟踪...

(MimeMessage message, MailboxAddress mailbox, SmtpResponse response)
   at MailKit.Net.Smtp.SmtpClient.<MailFromAsync>d__88.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at MailKit.Net.Smtp.SmtpClient.<SendAsync>d__99.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at MailKit.Net.Smtp.SmtpClient.Send(FormatOptions options, MimeMessage message, CancellationToken cancellationToken, ITransferProgress progress)
   at MailKit.MailTransport.Send(MimeMessage message, CancellationToken cancellationToken, ITransferProgress progress)
   at marketing_email_plus_removals.send_email(Boolean in_test, String in_email, String in_postcode) in E:\kunden\homepages\14\d650565413\www\marketing_email_plus_removals.aspx.vb:line 547

Answer 1

当您收到“需要身份验证”异常时，这意味着服务器将不允许您发送该消息，除非您进行身份验证。

发生这种情况时，请致电：

cl.Authenticate ("username", "password");

需要验证（意外）

1 个答案: