Changed Email Settings

When a victim of a phishing scam, it's common practice for the hackers to change your signatures, forwards, filters, and other settings.

A signature for an email is text that is automatically inserted at the end of an email. It is usually something you choose to set up and you decide when it gets inserted. Many people set it up to include their name and contact information.
Forwards can be set up to automatically forward to another email address. You can specify if you want all emails forwarded, or only specific kinds.
Inbox rules/filters can be used to automatically delete anything in your sent box, inbox, etc.

Learn how to check for these changes in the following clients:

Gmail Outlook 2010 Outlook 2013 and 2016 Outlook Web App