[RESOLVED] Creating Smtp Server

[Pale]

I was wondering if it was possible to create an Smtp server with my application and then use my application to send an email using the Smtp server i just created?

Can someone show me how to do this if it is even possible?

Thanks,

Pale.

[messycan]

So you want to create an SMTP server?

Look at the RFC: http://www.ietf.org/rfc/rfc0821.txt

That will get you started. I think you will only be able to send mails locally unless you get it hosted somewhere.

[Pale]

So you want to create an SMTP server?

Look at the RFC: http://www.ietf.org/rfc/rfc0821.txt

That will get you started. I think you will only be able to send mails locally unless you get it hosted somewhere.

No i mean use C# To Create the Smtp server.

[Pale]

Let me enlighten you on what i am actually wanting to do. I want to send an email without showing the From Address and make the from address show something specified by me.

I have this code now but how can i change it to do the above:

System.Net.Mail.MailMessage MyMessage = new System.Net.Mail.MailMessage(from,to,subject,body);
                                MyMessage.IsBodyHtml = false;
                                System.Net.NetworkCredential mailAuthentication = new
                                System.Net.NetworkCredential("smtpusername", "smtppassword");
                                System.Net.Mail.SmtpClient mailClient = new System.Net.Mail.SmtpClient("smtpserver", port);
                                mailClient.EnableSsl = false;
                                mailClient.UseDefaultCredentials = false;
                                mailClient.Credentials = mailAuthentication;
                                mailClient.Send(MyMessage);

I want to make the from address show something other than the actual from address.

The original question was because i thought that had something to do with the Smtp settings, so i wanted to create one and change the settings.

But if there is any other way than changing the smtp server settings please let me know.

If you have any other suggestions on this if it is impossible to do without changing the smtp settings please also let me know.

Because i know someone is going to say this, i am not wanting to spam, if i wanted to spam i could use one of those free online anonymous email services.

Thanks,

Pale.

[MMH]

Let me enlighten you on what i am actually wanting to do. I want to send an email without showing the From Address and make the from address show something specified by me.

I have this code now but how can i change it to do the above:

System.Net.Mail.MailMessage MyMessage = new System.Net.Mail.MailMessage(from,to,subject,body);
MyMessage.IsBodyHtml = false;
System.Net.NetworkCredential mailAuthentication = new
System.Net.NetworkCredential("smtpusername", "smtppassword");
System.Net.Mail.SmtpClient mailClient = new System.Net.Mail.SmtpClient("smtpserver", port);
mailClient.EnableSsl = false;
mailClient.UseDefaultCredentials = false;
mailClient.Credentials = mailAuthentication;
mailClient.Send(MyMessage);

I want to make the from address show something other than the actual from address.

The original question was because i thought that had something to do with the Smtp settings, so i wanted to create one and change the settings.

But if there is any other way than changing the smtp server settings please let me know.

If you have any other suggestions on this if it is impossible to do without changing the smtp settings please also let me know.

Because i know someone is going to say this, i am not wanting to spam, if i wanted to spam i could use one of those free online anonymous email services.

Thanks,

Pale.

There is one way.... but for that you need to configure/install SMTP server in the IIS. In IIS6 SMTP server is present. You can use it to send mails.

Nampespace

using System.Web.Mail;

Code Snippet

 MailMessage myMail = new MailMessage();
 myMail.To = txtTo.Text.ToString();
 myMail.From = txtFrom.Text.ToString();
 myMail.Subject = txtSubject.Text.ToString();
 myMail.BodyFormat = MailFormat.Html; // here you can choose: Plain or HTML
 string body = txtMessage.Text.ToString();
 myMail.Body = body; //set the body message
 SmtpMail.Send(myMail);

[cjard]

You dont need your own server to do that, and anyway, unless you own the dmoain youre claiming to be from and have a valid MX record, most en-route SMTP servers withh deem it spam anyway

You want to send an email to someone, pretending to be from someone else? Just use your existing mail server. If you dont own it, authenticate with it and it'll let you claim that youre god@heaven.net if you wish

End of the day, you need to read up on how SMTP works. There is NO difference between writing your own server, and just establishing a client based conenction to your ISPs server. If you own your own domain, run a free smtp server (dont bother writing one). If you can conenct direct to the target domain's MX then jsut use that (i.e. if you can from your PC telnet straight to hotmail.com's port 25 then you can send, but again, you fall foul of possibly not having your own MX record and hotmail wont believe your intentions to be good, regardless of whether you wrote a server or not

[Pale]

You dont need your own server to do that, and anyway, unless you own the dmoain youre claiming to be from and have a valid MX record, most en-route SMTP servers withh deem it spam anyway

You want to send an email to someone, pretending to be from someone else? Just use your existing mail server. If you dont own it, authenticate with it and it'll let you claim that youre god@heaven.net if you wish

End of the day, you need to read up on how SMTP works. There is NO difference between writing your own server, and just establishing a client based conenction to your ISPs server. If you own your own domain, run a free smtp server (dont bother writing one). If you can conenct direct to the target domain's MX then jsut use that (i.e. if you can from your PC telnet straight to hotmail.com's port 25 then you can send, but again, you fall foul of possibly not having your own MX record and hotmail wont believe your intentions to be good, regardless of whether you wrote a server or not

So what are you saying i should do something like this?

                        System.Net.Mail.MailMessage MyMessage = new System.Net.Mail.MailMessage();
                        MyMessage.BodyEncoding = System.Text.Encoding.ASCII;
                        MyMessage.SubjectEncoding = System.Text.Encoding.ASCII;
                        MyMessage.From = new System.Net.Mail.MailAddress("God@heaven.com");
                        MyMessage.To.Add(to);
                        MyMessage.Subject = subject;
                        MyMessage.Body = body;
                        MyMessage.IsBodyHtml = isbodyhtml;
                        System.Net.NetworkCredential mailAuthentication = new
                        System.Net.NetworkCredential(from, password);
                        System.Net.Mail.SmtpClient mailClient = new System.Net.Mail.SmtpClient(smtp, port);
                        mailClient.EnableSsl = ssl;
                        mailClient.UseDefaultCredentials = false;
                        mailClient.Credentials = mailAuthentication;
                        mailClient.Send(MyMessage);

That doesn't work, i get an exception, "The Sender email address does not match the one logged in."

[crackersixx]

Most mail servers will let you do exactly what you just tried. Yours apparently doesnt.

Unless you have another mail server to try, or the ability to install and host a new mail server, you are stuck.

Writing a mail server would be pointless.

[MadHatter]

the most important thing you can do is to read how smtp works.

you've missed the forest for the trees there. from and password are used by the smtp server to authenticate that you have permission to send a mail message on that server. you need a mail (smtp) server to send the mail. authentication name / password do not have to match the "from" header on the mail message itself, but the authentication credentials are often stored, and can be looked up in reverse (if its not sent along w/ the message itself, which is often the case), so it does you no good to spoof the from address, as most spam filters look for this as their #1 rule to process, so you have little chance of succeeding there.

as has been said, unless you own an smtp server, that "smtp client" code you're using will do nothing.

[Pale]

Most mail servers will let you do exactly what you just tried. Yours apparently doesnt.

Unless you have another mail server to try, or the ability to install and host a new mail server, you are stuck.

Writing a mail server would be pointless.

I have yet to find one that allows that, can you provide me with the name of one that does?

[crackersixx]

My mail server at work allows this just fine as I use this ability to send email alerts from some of my applications, such as "appfailure@mydomain.com".

my hosting provider for my domain (and domain email) allows this...
Although it is marked as spam, you can see i sent the following mail as someone@testing.com

Return-Path: <someone@testing.com>
Delivered-To: crackersixx@reversers.net
Received: (qmail 20801 invoked by uid 399); 30 Jul 2008 16:52:27 -0000
X-Spam-Checker-Version: SpamAssassin 3.2.4 (2008-01-01) on localhost
X-Spam-Level: ******
X-Spam-Status: No, score=6.8 required=14.0 tests=MISSING_DATE,MISSING_HB_SEP,
     MISSING_HEADERS,MISSING_MID,MISSING_SUBJECT,RDNS_NONE autolearn=disabled
     version=3.2.4
Received: from unknown (HELO reversers.net) (152.157.85.196)
     by mail.myhsphere.biz with ESMTP; 30 Jul 2008 16:52:27 -0000
Received-SPF: none (mail.myhsphere.biz: domain at testing.com does not designate permitted sender hosts)
     identity=mailfrom; client-ip=***;
     envelope-from=<someone@testing.com>;
    this is a test

[Pale]

My mail server at work allows this just fine as I use this ability to send email alerts from some of my applications, such as "appfailure@mydomain.com".

my hosting provider for my domain (and domain email) allows this...
Although it is marked as spam, you can see i sent the following mail as someone@testing.com

Return-Path: <someone@testing.com>
Delivered-To: crackersixx@reversers.net
Received: (qmail 20801 invoked by uid 399); 30 Jul 2008 16:52:27 -0000
X-Spam-Checker-Version: SpamAssassin 3.2.4 (2008-01-01) on localhost
X-Spam-Level: ******
X-Spam-Status: No, score=6.8 required=14.0 tests=MISSING_DATE,MISSING_HB_SEP,
     MISSING_HEADERS,MISSING_MID,MISSING_SUBJECT,RDNS_NONE autolearn=disabled
     version=3.2.4
Received: from unknown (HELO reversers.net) (152.157.85.196)
     by mail.myhsphere.biz with ESMTP; 30 Jul 2008 16:52:27 -0000
Received-SPF: none (mail.myhsphere.biz: domain at testing.com does not designate permitted sender hosts)
     identity=mailfrom; client-ip=***;
     envelope-from=<someone@testing.com>;
    this is a test

What about an smtp that i have access to.

[MadHatter]

the header he posted is what I was talking about (the received headers).

that's something that unless you write your own smtp server, you have very little control over (what it adds to your message).

and if you did have that (your own mail server implementation), all it takes is for your server to come to the attention of one major ISP and the IP will go on a black list that takes for ever to get removed from (we run our own mail server and had to go to hell and back to get it removed from everybody's black list).

what you're looking for is called an open relay. open relays are a security hole that need to cease to exist.

if you don't mind me asking, why are you so interested in spoofing your from address?

[cjard]

What about an smtp that i have access to.

What about telling us:

What domain youre actually from
What domain you want to appear to be from
What email address you want to spoof
What email address will be the recipient
What is the name of your existing SMTP software (and version)
Why you want the address to be spoofed

[Pale]

Ive seen other software that can do that, i was just wondering how i could do something like that.