How to prank your friend with fake mails!

Warning: This should not be used for illegal purposes. I don't take any responsibility for anything you do after reading this guide. This is made for fun purposes only!

So you want to prank your friends? Well, what is better than sending them a fake mail? It's a bit complicated, but it's sure fun!
Well, to do so, we need to find the ISP (the ones distributing internet for you), log into their mail server, and send a mail manually, telling the server what adress and content.

So, how do you do so? You use Terminal in OSX (this is possible in MS-DOS also, but I'll cover OSX for now)! So let's start:

Start with opening Terminal on your mac (applications->Utilities).

Type: telnet

Now, we need to find out what ISP you are using. visit http://whatismyipaddress.com/ to find out. Then visit their webpage to find out their mail server adress (smtp/pop a.s.o.) Should look like this: mail.domain.ext in example; smtp.itfactory.com.

Type: o mail.domain.ext 25
(a small o, not a 0 (zero))

25 is the port all mail is shipped from, therefor we need to specify that after the mail-adress.

You should receive something like:

Trying xxx.xxx.xxx.xxx ...
Connected to mail.domain.ext.
 Escape character is '^]'.
220 mail.domain.ext ESMTP Sendmail ?version-number?; ?date+time+gmtoffset?

Now, you're in but you have to say hello to "walk around".

Type: helo domain.ext
(or in this example; helo itfactory.com. Why only one L? I don't know)

You get:
250 mail.domain.ext Hello local.domain.name [loc.al.i.p], pleased to meet you
 
Now, we'll have to give the mail adress to send from, so

Type: mail from:desired@fakemail.com
(or net, org, biz or whatever)
(no space between : and desired mail adress)

Answer:
250 2.1.0 desired@fakemail.com... Sender ok
 
Now, we need the recipients adress, the frend you're going to prank.

Type: RCPT to:friends@mail.com
(no space between : and mail adress)

Answer:
250 2.1.0 friends@mail.com... Recipient ok
 
Type: data

Answer:
354 Enter mail, end with a single ".".


Now, you're ready to write the mail. Maybe you should start with a subject.

Type: Subject:Desired Subject
(no space between : and subject)

Then, press "enter" twice. The next thing you type will show as the text in the mail. You may press "enter" as much as you like now.

Type (example):

Hi friend!
This is a fake mail from a fake mail adress just to
show off how awsome I am, and ho show how easy it is to
use fake mail adresses to prank friends.

Cheers!

When you're finished writing the mail, just press enter twice, press . (dot)
and enter once again. The mail is finished, but not yet sent. The only thing left to do is to

Type: quit

You'll get the final answer:
221 2.0.0 mail.domain.ext closing connection
Connection closed by foreign host.
 
And you're done.

Problem solutions:
501 nouser@nosuchplace.here...Sender domain must exist
. 
The domain that you are sending from must exist



503 Need MAIL before RCPT


A recipient has been specified before a sender.



550 mail@domain.ext... Relaying Denied

You're probably not uing the right ISP. Try to find out once more what ISP you're using.