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I sent an Email to someone I know around 2pm, and got an Email back 1 hour later stating the following:

There is also an attachment titled "details00...txt (0.2 KB),", though I decided against opening it.

When I looked up the address in the title on Google, I've read many different things. Some stated it's a virus on my part, others say the person whom I'm trying to Email has the virus; some say the message gets delivered anyway, others say it doesn't.

Not really sure what to think or how to react. Although, most of what I looked up involved people getting the Email back from people whom they don't know, though some did know the person they were Emailing.

I've also read it's related to some Government and it detects Emails out of like 99.99999% that may be harmful to others.

Basically, if anyone knows anything, I would just like to know if I have some form of infection or something. Thanks.

Looks like a bouncing message. Did you spell your friend's e-mail address correctly?

There's no harm in opening text files, since they can't infect you or anything (No executable code). Just make sure it ends in .txt and not in .txt.vbs or .txt.exe

Maybe his inbox is full and therefore the mailer daemon rejects your mail?

Like Zergrinch said, find out if the attached file is really text only and take a look at it. The mailer daemon always places some additional infos about the error into the returned mail, so the details.txt seems to be the place where it stored them.

Make sure your mail client shows the real filename extension. Windows likes to hide "known extensions" in it's default state. The file.txt could be a file.txt.exe ;)

But in that case I also think it's just a standard answer from your mail provider.