URGENT PrestaShop expert needed to fix a spam issue with "Send a friend" module

We have a client who have had problems with his prestashop onlinestore. The issue is that there is a module called "Send to friend". This module have been hacked which causes hundreds of emails to be sent out from clients email. Before we deleted this module, this is the message which showed in the error log: [Fri Nov 25 12:19:34 2016] [error] [client [login to view URL]] qmail-inject: fatal: mail server permanently rejected message (#5.3.0), referer: [login to view URL] After we deleted this module we received this message in error log: [Fri Nov 25 15:05:05 2016] [error] [client [login to view URL]] Premature end of script headers: [login to view URL], referer: [login to view URL] [Fri Nov 25 15:05:08 2016] [error] [client [login to view URL]] File does not exist: /home/D/denariusno/www/modules/sendtoafriend, referer: [login to view URL] It seems that there are other files on webserver which are dependent on this module. Even if we have deleted this module the website still doesn't show on the domain. We need a PrestaShop expert who can help us solve this issue as soon as possible. If the right candidate is able to solve this issue, we can provide bigger projects to the candidate. We can discuss about payment, but be prefer that payment happens after everything has been solved and when everything is up and running as normal again.