In Mailfed, you can split and segment your subscriber lists in to any number of groups/segments based on any condition you wish. To do this, go to Dashboard > Lists > Lists > Select the list you want to segment > Segments > Create new. On the next screen, you can give a name to the segment and select an operator and click on “Add condition” button. This will now show a list of fields where you can compare and filter out the values based on any conditions you choose.
You can create a segment of subscribers in a particular country, or a group of people with same gender, or a segment of subscribers who joined your business ‘x’ years ago etc if those fields exist in the list.