Problem with sending emails ???!!!

[mbaa]

Hi all.

I will becoame crazy with sending mail from AdminCP to users and lost passwors emails and all email from vb .

Everytime I asked the hosting compant they told me this is a SPAM and you can't send it because it come from "nobody" .

I tried to edit file "mail.php"

and I put the information to use SMTP protocl to send mails
I edited this variables

var $smtpHost = "smtp.example.com";
 var $smtpPort = 25;
 var $smtpUser = false;
 var $smtpPass = false; 

and I don't know what is this variable

 var $smtpSocket = null; 

After this I recived many emails in my SMTP account and all mails were
"Mail delivery failed: returning message to sender "

Please, I want a solution for this problem .
I want to know how to either disable nobody or to use SMTP protocol in right way .

Thnak you for all.

[Jake Bunce]

Everytime I asked the hosting compant they told me this is a SPAM and you can't send it because it come from "nobody" .

Try enabling this option:

Admin CP -> vBulletin Options -> Server Settings and Optimization Options -> Enable "-f" Parameter

After this I recived many emails in my SMTP account and all mails were
"Mail delivery failed: returning message to sender "

For every email that was sent? Or was it just for some of them?