我们有一个订阅服务，它会向每位顾问发送一封邮件，说明他们未来几周的计划。
两周前，我们已从本地邮件服务器更改为 O365 邮件服务器。
自从这一变化以来，我注意到一些顾问没有收到他们应该收到的邮件。
这让我查看了 RS 日志，两周前我有 6 个人没有收到他们的电子邮件，而上周这个数字是 9。
我检查了他们的邮件地址中是否有任何拼写错误的数据，但一切都很好，因为我没有更改这部分设置（当我们仍然拥有本地邮件服务器时，这可以正常工作）。
notification!WindowsService_1!24f8!03/26/2021-16:00:13:: i INFO: Notification 84547a5f-930f-45e6-8085-0e738664c590 completed. Success: True, Status: Mail sent to a********.d******@*******.com, DeliveryExtension: Report Server Email, Report: OPS Individual Planning For Subscription, Attempt 0
emailextension!WindowsService_1!1a38!03/26/2021-16:00:13:: e ERROR: Error sending email. Exception: System.Net.Mail.SmtpException: Failure sending mail. ---> System.IO.IOException: Authentication failed because the remote party has closed the transport stream.
at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Net.TlsStream.ProcessAuthentication(LazyAsyncResult result)
at System.Net.TlsStream.Write(Byte[] buffer, Int32 offset, Int32 size)
at System.Net.PooledStream.Write(Byte[] buffer, Int32 offset, Int32 size)
at System.Net.Mail.SmtpConnection.Flush()
at System.Net.Mail.ReadLinesCommand.Send(SmtpConnection conn)
at System.Net.Mail.EHelloCommand.Send(SmtpConnection conn, String domain)
at System.Net.Mail.SmtpConnection.GetConnection(ServicePoint servicePoint)
at System.Net.Mail.SmtpClient.GetConnection()
at System.Net.Mail.SmtpClient.Send(MailMessage message)
--- End of inner exception stack trace ---
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at Microsoft.ReportingServices.EmailDeliveryProvider.EmailProvider.Deliver(Notification notification)
notification!WindowsService_1!1a38!03/26/2021-16:00:13:: e ERROR: Error occurred processing subscription 4ee16cfe-5e77-4da9-8433-d62a99d11ea2: Failure sending mail: Failure sending mail.
在第一行您可以看到操作成功，但之后您可以看到失败。
“身份验证失败，因为远程方已关闭传输流”
截至上周，我们还在运行 SQL Server 2016 SP2 的 CU15。
从我在网上发现的情况来看，它与 TLS 相关，但我已经检查过这一点，并且在我们的案例中检查了 1.2。另外，如果是 TLS，我会觉得有点奇怪，因为这是一个浏览器设置，并且订阅是由 SQL Server 本身管理的。
如果有人对此有解决方案，请告诉我！
亲切的问候，
凯文
