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Best way to send an E-Mail from a java Application

I've been searching for the best way to send an e-mail with an attachment by my java application. I want to use this as an users bug report with logger files. The recipient should be my own e-mail address. I'd prefer the use of an e-mail client.
I tried the following:
Send an e-mail with user authentification like this. I don't want to use this, because the user would need to reveal his e-mail account and password. Furthermore, I'd have to set the properties for every e-mail adress, which is impossible.
Send an e-mail directly to my own e-mail address like this in Listing 16.16 (didnt found an english example). The problem is every e-mail server is using POP authentification nowadays, that means the recipient e-mail server won't accept my e-mail.
Using the mailto URL syntax like this. Doesn't work aswell, because the attachment function isn't working properly in every e-mail client. Best solution so far is to brief the user to add the attachment by himself, after I would put it to his desktop. Or upload the data and add a link to the e-mail body.
The last way I've found is this one. As you could assume this won't work either, because the localhost needs to be connected to the internet and capable enough to send an e-mail.
Hopefully I explained my problem well enough. Is there a different way to send bug reports?

The generally accepted way to get around the problems you describe is to keep all the email logic server side, and then have your application call a web service with the appropriate parameters. It's pretty easy to knock a PHP script / servlet up that will do the job and then send the results on via email, put them in a mysql database or so on.
However, if you can't / don't want to / won't keep this server side, I'd recommend using JavaMail to create a MimeMessage, then using writeTo() to write this to an EML file.
You can then do the usual:
Desktop.getDesktop().open(emlFile);
...which will open the EML file with the default application for handing those files, which is almost always the mail client. Still not foolproof, but if you're determined on sending the email from the client directly I think that's as good as you'll get.

Java: adding attachment to the mail client launched using getDesktop().mail(URI)

In Java, how to launch the mail client along with the given file as its attachment - particularly using the method Desktop.getDesktop().mail(URI)
I am using Windows 7 and want to launch MS Outlook.

It is a good question.
Indeed the URI that sent as a parameter to method desktop.mail(URI) allows setting to, cc, bcc, subject, body and does not allow setting attachments. (see http://www.ietf.org/rfc/rfc2368.txt)
However attachments are actually specially formatted fragments of email body. Please read this for more details: http://techhelp.santovec.us/decode.htm.
This means that you can encode your binary attachment using Base64 and create email body that already contains the attachment of any generic file. I personally have not tried this but I believe it must work. Good luck.

As far as I know, it is unfortunatly not possible to specify any attachment using Desktop.mail(URI).
I've tried AlexR suggestion. It doesn't work if the file is too big because of the restriction of the number of characters in the URI.
However, it is still possible using JMAPI, though it only works on x86 platforms.
The ultimate way to make it work is using the JavaMail API, but it forces you to create your own GUI and to set the SMTP server configuration.. which is not pretty user-friendly.
If anyone as other suggestions, i'd be glad to know them.

Thunderbird api to send a mail via Java

I have been using Java mail API to send mails generated through the Java program. What I want to do now is to send a mail through Thunderbird mail client so that the mail get saved to the sent items folder of the user and the user can resend a mail if it has failed.
I also would like to know if it's possible to get a delivery report in the Java mail API.
Edit
I found out that our mail server is POP3 and it doesn't store mail. So is it a good idea to send another mail to the sender as well and define a rule that categorize those messages?

even if you send it with the java mail api (well gmail at least), you will still be able to see in the sent folder using thunderbird. as a matter of fact, 5 minutes ago, I saw this using a website that I build. I am sending emails using Java API, and when I check the send folder I can see them.

The InBox / Outbox in Thunderbird are normally mapped ti your IMAP-Account. The IMAP-Account is set on a mail server. All your mails and folders are stored on that mail server. the client (Thunderbird) only shows the contant from the server. By remote calls (IMAP-protocol) you can create/delete/edit/move folders and mails on the server. Sending a mail is not part of IMAP. Here you use the SMTP-Protocol. When you configure a mailaccount in Thunderbird you must configure IMAP & SMTP. When you send a mail Thunderbird does the following steps:
- Send Mail by SMTP-Protocol
- Create Mail in Outbox by IMAP-Protocol
SMTP & IMAP are totally different. But if you want to send a mail and see this mail in your outbox you must use both. You can program the same workflow with the java mail api.

If I get your question right, you are looking for a way to trigger mail sending via Mozilla Thunderbird from a Java program (an external program / software running on the same local machine).
You can achieve that via different methods:
calling the Thunderbird binary with command-line arguments
via SimpleMAPI, which Thunderbird supports
via XPCOM, also built into Thunderbird
What you won't be able to achieve easily is getting feedback from Thunderbird about the outcome of triggering / prompting the user to send a mail. But you could achieve that by using more difficult ways of integrating Thunderbird with your external software:
read and parse the actual MBOX inbox / mail sent / profile files in a user's profile. "using the X-Mozilla-Status headers (you could) figure out if a message is a new message (etc). A mbox file is essentially just a flat text file that has a seperator between the messages" (parentheses by me, source)
Write a bridging WebExtension Thunderbird Add-On that integrates in some way with your software. An extension has, via Thunderbird's WebExtensions API, essentially a hook for every feature Thunderbird has and your code Add-On could expose these internals in some way to your software.
AFAIK and sadly Thunderbird, as it ships, exposes no API or similar interface out of the box.

Auto Generated Mail

Perhaps this kind of question comes under not to ask category but for the sake of application I have to ask.So pardon me.
At the time of Log in,I found that(suppose)If I am unable to remember my password,then I have to put my email-id then an auto generated reply come from that's hosted site with
a new link for generating another new password or
simply sending password(that means password isn't encrypted,I guess) in reply.
watching the source code it's hard to predict,but I want to know(if they are using jsp) then which protocol is used for this auto generated mail what are the other things to remember to achive this, while I'm also making an application for auto generated mail.

I have done this using javax.mail api in java
google for sending mail using java...
define content of mail in template or resource file and send mail whenever user clicks on forgot password link.
It is using SMTP protocol only.

Is there a library for reading /var/spool/mail/ files?

How does one parse the mail files generated on a Linux system using Java? I mean, I want to be able to extract the From, To, Timestamp and Subject of the various emails inside the file. Any suggestions?

javax.mail.internet.MimeMessage.parse(InputStream)
it's protected but you can subclass it to use the method. However, the file format is quite simple, if you just want some headers, why not parse it on your own?

Those files belong to the Mail Transfer Agent and maybe the user's mail client. Other programs should tread very softly or better yet keep out altogether. Or is your program a mail client?
The "clean" way to do this would be to open up an SMTP or IMAP connection to the mail server / MTA and ask it for pieces of mail on behalf of your user, using his credentials that he gives you.
There's a Java mail API for this that knows how to do this well: http://java.sun.com/products/javamail/ .