我尝试使用远程邮件服务器从 VPS windows 2012 和 IIS 8 服务器发送邮件，我无法发送邮件，并收到错误
send Faild - System.Net.Mail.SmtpException: Failure sending mail. ---> System.Net.WebException: Unable to connect to the remote server --->
System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time,
or established connection failed because connected host has failed to respond <Ip Address> at System.Net.Sockets.Socket.DoConnect(EndPoint
endPointSnapshot, SocketAddress socketAddress) at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6,
Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception) --- End of inner exception stack
trace --- at System.Net.ServicePoint.GetConnection(PooledStream PooledStream, Object owner, Boolean async, IPAddress& address, Socket& abortSocket,
Socket& abortSocket6) at System.Net.PooledStream.Activate(Object owningObject, Boolean async, GeneralAsyncDelegate asyncCallback) at System.Net.ConnectionPool.GetConnection(Object owningObject, GeneralAsyncDelegate asyncCallback, Int32 creationTimeout) at System.Net.Mail.SmtpConnection.GetConnection(ServicePoint servicePoint) at System.Net.Mail.SmtpClient.Send(MailMessage message) --- End of
inner exception stack trace --- at System.Net.Mail.SmtpClient.Send(MailMessage message) at WebApplication1.Default.Page_Load(Object sender, EventArgs e)
使用的代码
<%
Dim Email As New System.Net.Mail.MailMessage( _"emails@domain.org", "email@domain.org")
Email.Subject = "test subject"
Email.Body = "this is a test"
Dim mailClient As New System.Net.Mail.SmtpClient()
'This object stores the authentication values
Dim basicAuthenticationInfo As _
New System.Net.NetworkCredential("username", "password")
mailClient.Host = "host"
mailClient.UseDefaultCredentials = False
mailClient.Credentials = basicAuthenticationInfo
mailClient.Send(Email)
%>
更新
无法从 vps 远程登录 smtp 服务器，但可以从本地系统远程登录 smtp 服务器。