java.mail without specifying SMTP server

[Alejandro Barrero]

I want to write code to send email without trying to specify the SMTP server.
I have tried DOS nslookup without success. On the other hand, it may be impossible and the SMTP server is not in the computer, I just don't know.

Your help will be greatly appreciated,

Alejandro Barrero

[William Brogden]

If you want to run your own mail server for testing, you can use the James open source Java server. I have used it for years, it doesn't require a whole lot of memory to run.

Bill

[Alejandro Barrero]

Thanks Bill. James definitely offers a solution; I just downloaded it and will start examining it in short detail. However, my code will be in an application that I will distribute; if I use mail, I will have to include James in the installation of the application. Searching further in the Internet I found Aspirin which appears to be an embeddable SMTP server. I am going to move in the direction of Aspirin and similar before I go for James.
Still, it should be possible to execute Dos commands to find the SMTP server.

[Pat Farrell]

I don't understand your request. The user has to setup the computer's applications to know the SMTP server, which is specified by the ISP or network administrator. I've never seen how a program can detect this. It could search for all possible mail clients, and snoop on their settings, but that may be hard to do in general and transportable.

Can you try rephrasing your request?

The answer of "use this mail package" seems over kill to me. All you need is the name of the host servicing SMTP (and maybe POP or IMAP)

[Alejandro Barrero]

What I would like to do, if it is possible, is to write code that can send email by specifying only the sender, the receiver, the topic and the contents.
I hope this is clear.

[Alejandro Barrero]

I found in another forum, a solution that is technically correct:

    
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.port", "587");
props.put("mail.debug", "true");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.localhost", "yoursite.com");
 
Session s = Session.getInstance(props, null);
s.setDebug(true);
 
MimeMessage message = new MimeMessage(s);
 
InternetAddress from = new InternetAddress("[e-mail]",
"Alejandro Barrero");
InternetAddress to = new InternetAddress("[e-mail]");
 
message.setSentDate(new Date());
message.setFrom(from);
message.addRecipient(Message.RecipientType.TO, to);
 
message.setSubject("Your subject");
message.setContent("Your message", "text/plain");
 
Transport tr = s.getTransport("smtp");
tr.connect("smtp.gmail.com", "[e-mail]", "password");
message.saveChanges();
tr.sendMessage(message, message.getAllRecipients());
tr.close();

But now the users of my program would have to have gmail addresses. I am going to continue looking.

[Dipak Bava]

Alejandro Barrero wrote:I want to write code to send email without trying to specify the SMTP server.
I have tried DOS nslookup without success. On the other hand, it may be impossible and the SMTP server is not in the computer, I just don't know.

Your help will be greatly appreciated,

Alejandro Barrero

Hi,

it's simple by using MX record look up of destination SMTP server.
Download dll from. removed, may be harmful

//Now prepare your message.
MailMessage mail = new MailMessage();
mail.To.Add("[e-mail]");
mail.From = new MailAddress("[e-mail]");
mail.Subject = "Send email without SMTP server";
mail.Body = "Yep, its workin!!!";

//Send message
string domain = mail.To[0].Address.Substring(mail.To[0].Address.IndexOf('@') + 1);
//To Do :need to check for MX record existance before you send. Left intentionally for you.
string mxRecord = SendSMTP.DnsLookUp.GetMXRecords(domain)[0];
SmtpClient client = new SmtpClient(mxRecord);
client.Send(mail);

Have look at http://dvgoswami.googlepages.com/ for complete details.


Done!

Tx.
Dipak.

[Rob Spoor]

Dipak,

I removed your post yesterday on purpose, for the following reasons:

1) you kicked a 10 month old thread: http://faq.javaranch.com/java/DontWakeTheZombies
2) you posted the exact same post last month in https://coderanch.com/t/416571/Other-JSE-JEE-APIs/java/we-will-Develop-Send-Email
3) your post links to a DLL that can do god knows what

If you still want to post your links, this is the place to go.