E-Mail senden läuft in ein Fehler

Smartstore.Net.Mail.MailException: The read operation failed, see inner exception.
---> System.IO.IOException: The read operation failed, see inner exception.
---> System.TimeoutException: Operation timed out after 5000 milliseconds
---> System.Threading.Tasks.TaskCanceledException: A task was canceled.
at MailKit.Net.NetworkStream.ReadAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)
--- End of inner exception stack trace ---
at MailKit.Net.NetworkStream.ReadAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)
at System.Net.Security.SslStream.EnsureFullTlsFrameAsync[TIOAdapter](CancellationToken cancellationToken)
at System.Runtime.CompilerServices.PoolingAsyncValueTaskMethodBuilder`1.StateMachineBox`1.System.Threading.Tasks.Sources.IValueTaskSource<TResult>.GetResult(Int16 token)
at System.Net.Security.SslStream.ReadAsyncInternal[TIOAdapter](Memory`1 buffer, CancellationToken cancellationToken)
--- End of inner exception stack trace ---
at System.Net.Security.SslStream.ReadAsyncInternal[TIOAdapter](Memory`1 buffer, CancellationToken cancellationToken)
at System.Runtime.CompilerServices.PoolingAsyncValueTaskMethodBuilder`1.StateMachineBox`1.System.Threading.Tasks.Sources.IValueTaskSource<TResult>.GetResult(Int16 token)
at System.Threading.Tasks.ValueTask`1.ValueTaskSourceAsTask.<>c.<.cctor>b__4_0(Object state)
--- End of stack trace from previous location ---
at MailKit.Net.Smtp.SmtpStream.ReadAheadAsync(CancellationToken cancellationToken)
at MailKit.Net.Smtp.SmtpStream.ReadResponseAsync(CancellationToken cancellationToken)
at MailKit.Net.Smtp.SmtpStream.SendCommandAsync(String command, CancellationToken cancellationToken)
at MailKit.Net.Smtp.SmtpClient.AuthenticateAsync(Encoding encoding, ICredentials credentials, CancellationToken cancellationToken)
at Smartstore.Net.Mail.MailKitSmtpClient.ConnectAsync()
--- End of inner exception stack trace ---
at Smartstore.Net.Mail.MailKitSmtpClient.ConnectAsync()
at Smartstore.Net.Mail.DefaultMailService.ConnectCore(IMailAccount account, Nullable`1 timeout, Boolean async)
at Smartstore.Core.Messaging.QueuedEmailService.SendMailsAsync(IEnumerable`1 queuedEmails, CancellationToken cancelToken)
at Smartstore.Core.Messaging.Tasks.QueuedMessagesSendTask.Run(TaskExecutionContext ctx, CancellationToken cancelToken)
at Smartstore.Scheduling.TaskExecutor.ExecuteAsync(TaskDescriptor task, HttpContext httpContext, IDictionary`2 taskParameters, Boolean throwOnError, CancellationToken cancelToken)


System.IO.IOException: The read operation failed, see inner exception.
---> System.TimeoutException: Operation timed out after 5000 milliseconds
---> System.Threading.Tasks.TaskCanceledException: A task was canceled.
at MailKit.Net.NetworkStream.ReadAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)
--- End of inner exception stack trace ---
at MailKit.Net.NetworkStream.ReadAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)
at System.Net.Security.SslStream.EnsureFullTlsFrameAsync[TIOAdapter](CancellationToken cancellationToken)
at System.Runtime.CompilerServices.PoolingAsyncValueTaskMethodBuilder`1.StateMachineBox`1.System.Threading.Tasks.Sources.IValueTaskSource<TResult>.GetResult(Int16 token)
at System.Net.Security.SslStream.ReadAsyncInternal[TIOAdapter](Memory`1 buffer, CancellationToken cancellationToken)
--- End of inner exception stack trace ---
at System.Net.Security.SslStream.ReadAsyncInternal[TIOAdapter](Memory`1 buffer, CancellationToken cancellationToken)
at System.Runtime.CompilerServices.PoolingAsyncValueTaskMethodBuilder`1.StateMachineBox`1.System.Threading.Tasks.Sources.IValueTaskSource<TResult>.GetResult(Int16 token)
at System.Threading.Tasks.ValueTask`1.ValueTaskSourceAsTask.<>c.<.cctor>b__4_0(Object state)
--- End of stack trace from previous location ---
at MailKit.Net.Smtp.SmtpStream.ReadAheadAsync(CancellationToken cancellationToken)
at MailKit.Net.Smtp.SmtpStream.ReadResponseAsync(CancellationToken cancellationToken)
at MailKit.Net.Smtp.SmtpStream.SendCommandAsync(String command, CancellationToken cancellationToken)
at MailKit.Net.Smtp.SmtpClient.AuthenticateAsync(Encoding encoding, ICredentials credentials, CancellationToken cancellationToken)
at Smartstore.Net.Mail.MailKitSmtpClient.ConnectAsync()


System.TimeoutException: Operation timed out after 5000 milliseconds
---> System.Threading.Tasks.TaskCanceledException: A task was canceled.
at MailKit.Net.NetworkStream.ReadAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)
--- End of inner exception stack trace ---
at MailKit.Net.NetworkStream.ReadAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)
at System.Net.Security.SslStream.EnsureFullTlsFrameAsync[TIOAdapter](CancellationToken cancellationToken)
at System.Runtime.CompilerServices.PoolingAsyncValueTaskMethodBuilder`1.StateMachineBox`1.System.Threading.Tasks.Sources.IValueTaskSource<TResult>.GetResult(Int16 token)
at System.Net.Security.SslStream.ReadAsyncInternal[TIOAdapter](Memory`1 buffer, CancellationToken cancellationToken)


System.Threading.Tasks.TaskCanceledException: A task was canceled.
at MailKit.Net.NetworkStream.ReadAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)

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