1 System.Net.Mail.SmtpException: Failure sending mail. ---> System.InvalidOperationException: Asynchronous operations are not allowed inthis context. Page starting an asynchronous operation has to have the Async attributesettotrueand an asynchronousop 甭理他什么页面需要异步,直接把发邮件代码仍到 Task....
using System; using System.Net; using System.Net.Mail; class Program { static void Main() { try { string smtpHost = "smtp.example.com"; int smtpPort = 587; // 使用587端口进行STARTTLS加密 string fromAddress = "your-email@example.com"; string toAddress = "recipient@example.com"; string...
System.Net.Mail.SmtpException: Failure sending mail. ---> System.IO.IOException: Unable to read data from the transport connection: The connection was closed. at System.Net.Mail.SmtpReplyReaderFactory.ProcessRead(Byte[] buffer, Int32 offset, Int32 read, Boolean readLine) at System.Net.Mail.S...
Since this is intermittent, you are almost certainly exceeding the throttling limits and being rejected. The error log should have more than 1 message indicating you are being throttled or blocked.See:https://learn.microsoft.com/en-us/exchange/mail-flow-best-practices/how-to-set-up-a-multi...
通过System.Net.Mail使用SSL协议发送邮件失败并报错System.Net.Mail.SmtpException: Failure sending mail 详细报错信息: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 System.Net.Mail.SmtpException:Failure sending mail.--->System.IO.IOException:Unable to read data from the transport connection:The conn...
Mail.SmtpException: Failure sending mail System.NullReferenceException: 'Object reference not set to an instance of an object.' System.Data.DataTableCollection.this[string].get returned Nothing System.NullReferenceException: Object reference not set to an instance of an object. ERROR System.OutOf...
一、问题描述 1、问题现象通过System.Net.Mail使用SSL协议发送邮件失败并报错 System.Net.Mail.SmtpException: Failure sending mail 详细报错信息...之后还是不够安全,因此又出现了SSL的升级版TLS协议,由于建立连接时的区别又分别被称为显示SSL和隐式SSL。...二、解决办法 1、使用System.Web.Mail System.Web.Mail...
SMTP operation failed with the following details: Server:smtp.office365.com; Port:587(A value of -1 indicates default); Username:example@example.com; Error Message: Failure sending mail.. [Altiris.NS.Exceptions.AeXException @ Altiris.NS] ...
$username = 'smtp-test@test.com' #must be the same like the From parameter in the Send-Mail cmdlet $recipient = test@test.com' #can be changed $subject = 'SMTP Auth Test Mail' $Body = 'This is a test mail via smtp authentication and powershell' ...
Winmail Server 退信实例:delivery failure: the message matches up to the filter rule(level: system, name:xxx) 其他系统退信实例: ***@SINA.COM : Failure reply of RCPT to ***@SINA.COM from 202.106.182.168, 445 服务器拒绝 - server rejected (#4.4.4) ***...