After paying 3 years in advance to my host, some emails of the owner of a project I work with (very small thing, but still..) began to disappear. She doesn't receive the messages and neither the person who sends receives a error message. I've contacted them but no one could found out what is happening.

In this meantime, I had to change the PHP version (there is a version control in their cPanel). Just after changing, Mysqli and PDO stopped working. It took about 4 to 5 days for them to fixed it (shared host).

Back to today, I needed to send and receive lots of emails of this project. As we are losing tons of legitimates mails, we started to cc our personal emails to avoid misscomunication (deadlines are very important). Of course, exactly today, Microsoft's​ mail stopped accepting any emails of our host IP, as it appears someone has an Trojan hosted there. Of course, except me, everyone else personal email address are Outlook.com.