How to send weekly updates to my WP users

How to send updates to my wordpress users,is there any plugin to do that or how to collect all emails of my users from wordpress dashboard .

 

Try out Subscriber2: http://wordpress.org/extend/plugins/subscribe2/

But I recommend you use service from aweber.com to prevent spamming.

 

I can not spend money now, i would go for wordpress plugin .

 

I second the subscriber2 recommendation. Give it a try and see how you go.