Mail upon joining

Hi can someone help me please, i am receiving mail that members are joining but they are not getting notifications at all when joining it says check your email but they dont get anything?

I dont know what i am suppose to check or change anything in admin ?

Thanks for your time :)

http://www.boonex.com/trac/dolphin/wiki/TutorialCronJobSetup that should get the emails working. 

Again thank you  so much  wonderful help :)

I have tried and the hosting has tried we just can not get the mail coming through. ?

I would say if the hosting company is helping you with this problem my first questions are:

At what point is the mail not being delivered? Is the script connecting to the mail server? Is the mail being sent by the mail server but not received by the end user? Your mail logs should help figuring these things out.

Honestly there are people here FAR BETTER equipped at helping you with this problem. I am just pointing you to the basics as if I were trying to personally track the issue.  

Appreciate your help as i know nothing at all about the mail part. I sent them the link you gave me. I receive mail when new users join. They do not receive  the email upon joining at all . It says it was successfully send and should arrive with in the minute but never does

I would suggest to install and configure SMTP mailer module.

Thank you will try that

As per above logs it shows that email sent from your contact form do not
have a valid envelop sender and that's why while sending an email from
contact form it shows an invalid email address like
root@cbr***.webhosting.openconnect.com.au which is a default cPanel
email address.   Can you please confirm with your web developer if the email is actually
getting generated.  Can some please tell me if they are on the right track we have tried everything. Still cant get it to work. Thank you 

Based on what is being said, I would suggest thhat you confirm you have created an email account on your webhost, that the email account name matches your domain name (something@yoursite.whatever) and that all the email address you created is the email address set in your administration area (again thiss stuff is out of my league so I may be talking out my *(&#$@&^$ 

:) 

lol  thanks i have given up im having someone look in to it from here for me now ... :) Appreciate your time you've helped me with a few things now its been great. :)