Email Sender authentication like Eart*****
For those who dont know how the earth link system works:
A new person send you an email - the system responds by asking them to authenticate their sending address by entering a hard to read # into a text field. The sender only had to do this 1 time and is whitelisted.
Spam gets held in a holding area for a few days and if the sender doesnt respon, the email is deleted.
If there isn't a module for exim, is there a module for another open-source Linux based email system cpanel supports?
