try this:
Hope it helps!
$smtp = @fsockopen("<host>",25,$errno,$errdesc,30);
if(!$smtp)
{
print "Could not connect to SMTP server";
}
else {
print "Connected to SMTP server\n";
print fgets($smtp,1024);
$helo = fputs($smtp, "helo server\n");
print fgets($smtp,1024);
$send = fputs($smtp, "MAIL FROM: [email]myemail@whatever.com[/email]\n");
print fgets($smtp,1024);
$send2 = fputs($smtp, "RCPT TO: [email]whoever@whatever.com[/email]\n");
print fgets($smtp,1024);
$send3 = fputs($smtp, "DATA\n");
print fgets($smtp,1024);
$test="Hello! Just testing!!";
$send4 = fputs($smtp, "$test\n.\n");
print fgets($smtp,1024);
fputs($smtp,"QUIT\n");
print fgets($smtp,1024);
fclose($smtp);
}