Peter's Gekko

Thanx ;-)

I configured my SMTP settings and I dont receive any error message. But the mail is not being sent. What should I do about it?

@Dan,

you need IIS. That's your mailserver. Cassini (vs 2005 webserver) doesn't have one.

@PKaur,

check you IIS log. That should tell you what went wrong.

Hi,

i copy and paste all your codes and edit a little.

protected void Button1_Click1(object sender, EventArgs e)

   {

       MailMessage message = new MailMessage();

       message.From = new MailAddress("Me@Spammer.net");

       message.To.Add("testing123@hotmail.com");

       message.Subject = "Hello";

       message.Body = "Hi there!";

       message.BodyEncoding = System.Text.Encoding.ASCII;

       message.IsBodyHtml = true;

       message.Priority = MailPriority.Normal;

       SmtpClient smtp = new SmtpClient("Localhost");

       smtp.Send(message);

   }

I realised i can only send mail when

1) The checkbox "Allow all computer which successfully auth.. .. " is checked.

2)message.From = new MailAddress("Me@Spammer.net");

 i can only use "Me@Spammer.net" and not other e-mail address .

 If i use other e-mail,No e-mail will be send.

please guide me..

thanks in advance

Hard to say.

- Does localhost map to 127.0.0.1 ?

- Is there no other restriction set elsewhere ? In the firewall?

What puzzles me is that only the fake email address works. Doe sthe name you use map to an existing user ? In the latter case it points to "something else" fiddling with the permissions on your machine.

Actually I doing project in my school and under school network ,i cannot even send out the mail .. (Perhaps my school block it or smth. . )

I was actually keep changing the IP in the relay . . from 127.0.0.1 to my own ip address..

i got two things to clarify..

Under the Delivery tab(of SMTP option) i click on advance..

Under domain should i type in localhost or the domain(properties of my computer, computer name tab,the domain stated there ? ) of my computer?

One last thing is this statement,

SmtpClient smtp = new SmtpClient("Localhost");

do i need to change the content of "Localhost" to my ip such as  "192.168.0.3"?

or just leave it as "localhost" ?

Sorry if u find my questions annoying as i just started with c# project this semester ,that's why a lot of things i dont really understand . .

Have a nice day !

Oh ya, where can i find IIS log?

You bet school has blocked ending mail. They don't want to be blacklisted as a spam source :)

Concerning your questions. As they get much broader than the scop of this post: may I suggest the MSDN docs. You'll get a much broader view there and learn a lot lot more then from my comments.

Enjoy your course, B#!

Thanks anyway =)

u are nice

This information  was verymuch useful it solved my problem

The Solution for the Error "Mailbox unavailable. The server response was: 5.7.1 Unable to relay for (name)  "  is working  Thanks a lot......

As for so many: It solved my problem. Thanks a lot ...

I have done all the things listed above, but it is still not working .i got same error

Thanks, just what I need to fix the problem.

Hi!

I receive the following message:

THE E-MAIL ADDRESS USED TO SEND MESSAGES IS NOT THE SAME AS THE ADDRESS THAT YOU AUTHENTICATED WITH (#5.7.1)

When sending message. My from address is a no-reply@mydomain.com.br (does not exists on the server).

Does anyone knows how to help me figure out this ??

Ueslei

This requires some fiddling with permissions. Beyond my working knowledge. Googling around with your error message does provide usefull hints.

Thank you

what can do to remove 5.7.1 error message box.......

help.....................................................

Prevent it appearing ? As described above. And if when it apperas click OK ?

i have above code and i have complete send mail soccesfully but not recieve mail.

Thankyou very much.

This information  was verymuch useful it solved my problem.

Once more thankyou

But I tried setting the relay restrictions as described and it wouldn't work with 127.0.0.1  and the option Only the list below.  When I changed it to the option All except the list below it deleted the 127.0.0.1 from the computer list so there is nothing there now and it works fine.  The other option on the Relay Restrictions page for Allow All computer ... at the bottom is unchecked too.

First of all.. thanks a lot the fix helped me as well, but I have another problem. I don't receive the mail although I was told that the mail was succesfully send.

2nd question .. I'm going to export my project from localhost to a real life asp.net server. Is this going to work on that server to with "localhost" as server describtion or do I have to change it to the server's IP Address?

Thanks a lot..

Regard Matthias

I can't analyze your mail traffic from a distance ..

Localhost is just an alias for the 127,0,0,1 ip address. When the entry is in the lmhost file of the server it will work. Else not.

Hi

In trying to send a simple MailMessage under the SmtpClient, I get

Request for the permission of type 'System.Net.Mail.SmtpPermission, System, Vers

ion=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

I've Googled and read the MSDN docs about the SmtpPermission class (which says the SmtpClient class demands an SmtpPermission - what does that mean?), but no luck.

Any ideas?

Thanks

Saved me some grief

Thanks! Just what I was looking for...

Hai it's very good  this is programs is working in my local machine but how to develop in my real product server.

In trying to send a simple MailMessage, I get

Mailbox unavailable. The server response was: 5.7.1 Unable to relay for <xxx>

What will be the problem?

Is it possible to send smtp mail through proxy server?

Why isn't this more plainly stated in the documentation.  I understand that the "old way" in 1.1 wasn't as secure, but this little how-to should have been in the MS docs - or if it is, easier to find.

Hi,This is not what i was looking for// what i needed is,

If i click on a link button say "Contac Us" a window for outlook should open up with the email address i specify in the code.

Can u help

My mails are always dumped in the "Queue" folder, which means my SMTP is working fine.

But thereon the mails are never sent to the intended recipients.

Please help.

Thanks Master, I'm done

Hey  your code helped our team a lot thank you

Hi

I've followed all the instructions right at the top of this page.  The emails appear to get sent (i.e. my code doesn't break) however the emails aren't received by the recipient I specify (the recipient happens to be me for testing purposes).

Here's the code that executes succesfully:

SmtpClient theClient = new SmtpClient("localhost");

theClient.Send(message);

The emails aren't within any of the sub folders of C:\Inetpub\mailroot.

Any ideas where they are?

That's beyond the scope of this code. Looks like there is a problem with receiving emails. Does the email-box accept mail from other senders ?

Thank you, that worked for me.

that worked for me, Thank you.

In trying to send a simple MailMessage, I get

Mailbox unavailable. The server response was: 5.7.1 Unable to relay for <xxx>

What will be the problem?

This was the only straighforward explanation and solution to the "unable to relay" error. Thanks a lot

Have anybody tried to send emails to an internet email account, such as gmail or hotmail?

I am able to send emails to domain accounts but not with internet email accounts.

Thanks,

My error was this

CDO.Object didnt found. check if your configuration allow smtp.

it highlight the error at mailClient.Send(mailMessage)

did i got confuguration error ?

Hello,

I am using the simple code to send emails but I am getting the  Mailbox unavailable error.

As per your instructions  i tried to configure the IIS.

I have a setting under IIS which is set to allunassigned IP . If this is the case how can i set to asp.net to send emails.

Any help will be much apprceiated.

Regards,

Teju

I have configured Default SMTP as you told above,but iam getting Exception as Mailbox unavailable. The server response was: 5.7.1 Unable to relay for sama.lingareddy@gmail.com

here sama.lingareddy@gmail.com this is from address

My code is this,but iam getting Exception as Mailbox unavailable. The server response was: 5.7.1 Unable to relay for sama.lingareddy@gmail.com,iam trying to send an email from the Default SMTP server,Suggest me.

Private Sub SendMailWithIIS()

       Dim Message As New MailMessage

       Message.From = New MailAddress("sama.lingareddy@gmail.com")

       Message.To.Add("sama.lingareddy@gmail.com")

       Message.Subject = "OmSaiRam"

       Message.Body = "Om sairam"

       Message.BodyEncoding = System.Text.Encoding.ASCII

       Message.IsBodyHtml = True

       Message.Priority = MailPriority.Normal

       Dim smtp As New SmtpClient("Localhost")

       smtp.Send(Message)

   End Sub

but now i want to send to yahoomail but how to send to yahoo mail please hepl me?

Thanks alot, I've been looking for this solution for months.

JiommyMac

"And now my .NET code can spam everybody. Use with care !"

It's not that I need to send spams but not sure how it is a spam method.

Email details will show a real IP address anyway.

Pingback from  Nathan Li&#8217;s Blog  &raquo; Blog Archive   &raquo; Mailbox unavailable. The server response was: 5.7.1 Unable to relay for x@x.com

Thanks!

thanks a lot man, greate job.

i have written the code below but it simply redirect the mail to  C:\Inetpub\mailroot\Queue rather then sending to  the person i want can some one help me

MailMessage message = new MailMessage();

       message.From = new MailAddress("Me@Spammer.net");

       message.To.Add("tiw_20062000@yahoo.com");

       message.Subject = "gfgdfg gdf gdfg dgf gdg bvc bcv b";

       message.Body = "cvx xcv xvx vc cvx v vcx xc v vx x ";

       message.BodyEncoding = System.Text.Encoding.ASCII;

       message.IsBodyHtml = true;

       message.Priority = MailPriority.Normal;

       SmtpClient smtp = new SmtpClient("192.168.10.79",26);

       smtp.Send(message);

the code below simply redirect to C:\Inetpub\mailroot\Queue and doesn't send to the person i want

{

  MailMessage message = new MailMessage();

  message.From = new MailAddress("Me@Spammer.net");

  message.To.Add("tiw_20062000@yahoo.com");

   message.Subject = "gfgdfg gdf gdfg dgf gdg bvc bcv b";

    message.Body = "cvx xcv xvx vc cvx v vcx xc v vx x ";

    message.BodyEncoding = System.Text.Encoding.ASCII;

     message.IsBodyHtml = true;

      message.Priority = MailPriority.Normal;

      SmtpClient smtp = new SmtpClient("192.168.10.79",26);

      smtp.Send(message);

}

thanks its working that is it dosent get an error but the mail is not received please send another option

THANK YOU!  This was a huge help for such a small issue!

Thanks for your tip. It really helped me.

Interesting solution,

- Shelon Padmore

I'm having the same problem as Brajesh.. my mails are stuck in the queue folder.. how do i fix this?

I have tried with the above code, but still i'm getting error like Message Sending Failure. We r using GoDaddy server. what is the solution

@ Brajesh and all others having problems with the quueue of their server:

This code posts the mail messag eto the queue. After that it's in the hands of the mailserver and out of the scope of this post.

Contact your sysadmin to get it fixed.

hey but the mail is not delivering..... Is there be any firewall problem.... how to overcome that?

Thank you so much... now I can develop and test on my dev box and it still works for our production server.  What a pain!!!!!

thanks for ur notes.

its nice to work from localhost.

thanks once again.