A few days ago I requested SSH access to our old server where we currently host our email. We are in the process of moving over to a new host. Ever since requesting the access from the admin, emails which are being sent from the new server, eg. wordpress/cs-cart/prestashop, are not being delivered to email accounts on the old server. The email accounts on the old server are otherwise working fine, and sending email from the new server to accounts hosted elsewhere works fine as well.
Is it possible the old admin, being upset about losing a client, set up some kind of block? Looking through .bash_history, it has obviously recently been cleared.