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问题:
I'm getting strange occurance on our servers when I am trying to send an email using SmtpClient class via an ASP MVC3 project. This is the code I am using.
try
{
var client = new SmtpClient("MailServer");
client.UseDefaultCredentials = true;
MailMessage message = new MailMessage("me@mydomain.com", "friend@mydomain.com", "Test Message", "Test Body");
client.Send(message);
}
catch (Exception ex)
{
// Do Nothing
}
I have deployed on three environments; on Windows 7 (using VS 2010 IIS) it sends the email fine, on the Windows 2003 IIS6 machine it sends the email fine, finally on the Windows 2008 R2 II7 server I get the following error:
Mailbox unavailable. The server response was: 5.7.1 Client does not have permissions to send as this sender using username
Can anybody advise on what may be causing this. I have noticed that when I view User.Identity.Name
, this is returning an empty string.
回答1:
It is likely that the mail server does not support sending anonymous emails and will require credentials to be specified which are registered on the mail server.
You can specify the credentials like so:
client.UseDefaultCredentials = false;
client.Credentials = new System.Net.NetworkCredential("username", "password");
Hope this helps.
回答2:
If you are using an exchange server and the logon account and sender email are different you will got the error "does not have permissions to send...". This is because of the account permissions. You must grant "send as" permission to the logon account.
回答3:
I solve this problem removing authentication credentials from web.config
<system.net>
<mailSettings>
<smtp from="SystemAdmin@domain.do">
<!--network host="EXCH-SERVER" port="25" userName="userName" password="password" defaultCredentials="false" /-->
<network host="EXCH-SERVER" port="25" />
</smtp>
</mailSettings>
回答4:
If you have try everything and it is still failing, one possibility is that the server accept only anonymous user. If you try to connect with credentials:
defaultCredentials="true"
defaultCredentials="false" userName="foo" password="false"
Then the server WILL return the error .NET SMTP Client - Client does not have permissions to send as this sender
.
That's weird, but as a last resort, just try the simple:
defaultCredentials="false"
回答5:
For me it was using different credentials -
In network credentials I was using -
new NetworkCredential(smtpUser, smtpPassword)
and in fromAddress
var fromAddress = new MailAddress("anotheruser@gmail.com", string.Empty);
Where when sending email where fromAddress is different than actual network credentials will lead this issue.
See below -
using (var message = new System.Net.Mail.MailMessage(fromAddress, toAddress)
{
Subject = Keys.MailSubject,
Body = body,
IsBodyHtml = true
})
{
smtp.Send(message);
}
The simple fix is to keep both the mails same as network credentials's one.
回答6:
What does User.Identity.IsAuthenticated return, if it returns false that is your problem. You are trying to send mail as an unauthenticated user.
回答7:
Had the same issue - the credentials from ASP.Net were never going to be something that could send e-mail in my environment. So I figured out this path through the mess (which also includes the possibility that NTLM doesn't always work right and that I was putting the mail configuration info in web.config):
System.Net.Configuration.SmtpSection section = ConfigurationManager.GetSection("system.net/mailSettings/smtp") as System.Net.Configuration.SmtpSection;
// set up SMTP client
SmtpClient smtp = new SmtpClient();
System.Net.CredentialCache myCache = new System.Net.CredentialCache();
NetworkCredential myCred = new NetworkCredential(section.Network.UserName, section.Network.Password);
string host = section.Network.Host;
int port = section.Network.Port;
// do this because NTLM doesn't work in all environments....
if (myCred != null)
{
myCache.Add(host, port, "Digest", myCred);
myCache.Add(host, port, "Basic", myCred);
myCache.Add(host, port, "Digest-MD5", myCred);
myCache.Add(host, port, "Digest MD5", myCred);
myCache.Add(host, port, "Plain", myCred);
myCache.Add(host, port, "Cram-MD5", myCred);
myCache.Add(host, port, "Cram MD5", myCred);
myCache.Add(host, port, "Login", myCred);
//myCache.Add(host, port, "NTLM", myCred);
}
smtp.Credentials = myCache;
smtp.UseDefaultCredentials = false;
//smtp.EnableSsl = true;
Depending on your configuration, you might need to uncomment the last line.
回答8:
One thing worked for me using Visual studio 2013 running packages.
i removed the 'Use Windows Authentication' tag in the SMTP Connection Manager Editor.