Okay, so long long ago I was too happy about OpenInviter and I saw it in VLDpersonals I was like WOW
but I never knew that if your hosting/server is not allowed to send lot of emails to Yahoo , Hotmail, Gmail or your emails get deferred.

So if someone was importing 600 contacts , Openinviter was trying to send emails to all those people automatically!
and then Emails won't go through , they will be refused by mail servers like Hotmail , yahoo , gmail etc..

and Your server will most likely be balcklisted, also  you can not offer unsubscribe option to those who receive emails so most likely they will mark the email as spam and you end up getting nothing and never become a big site.

So after learning PHP and getting really far with it I have customized OpenInviter to look like this :
http://pikacho.com/index.php?m=invitefr … eckfriends

When a user logs in the site will redirect him to that page

Once he imports contacts those contacts will be stored in temporarry database
that has 2 tables , 1 for emails and one for unsubscribed users

and I have a script and a cronjob set to hit the script every 5 minutes
so every 5 minutes my script pull few emails from database and send them the invivation!

also I included an unsubscribe link that contains the reciptient email so once he click it his email will be stored in the unsubscribed users table and so My email script will check again if the email exsist in my unsubscribed user database bfore sending the email !

What do you think of this?