Spam filters and setting safe sender

Spam filters are fantastic, only what do we do when every time an unwanted sender enters the spam folder?

When a particular sender gets put in the junk mail folder every time and this was not your intention,
you can add this sender to the trusted sender list.

There are numerous mail programs and through this link has an overview and instructions :
safeafzender.nl
.

Below we have pictured the steps of 2 popular mail providers :

Hotmail

GMail