mail function is acting lazy in my new server

[npsari]

Hi there users,!

 

I recently moved servers, from a shared one to a dedicated one

 

In my shared one, the emails i send used to arrive fast, and they do arrive!

 

But in my new server now, my sites cant send emails so fast, and it takes 3 hours to arrive at yahoo, and it never arrives at hotmail

 

I use this normal mailing script...

 

if(mail($sendto, $subject, $message, "From: $sender")){
print ("Your message has been sent, Thank you");
}else{
print"Message could not be submitted due to an error!";
}

 

Do you know how can i make things nice like before

 

Why is hotmail blocking my emails, how can i fix all this