You can manage custom fields through the admin menu (click the cogwheel upper right hand side of Mautic).
The fields page will let you view all existing contact fields as well as any custom contact fields you’ve created.
The January release (version 2019.01) of Mautic includes several new features and enhancements, as well as the resolution of over 20 bugs.
Best Practices for giving your emails the best chance to be delivered properly
Best Practices for keeping your prospect lists clean
Bring your own ESP/Transport to Mautic – follow these simple steps to configure your service of choice, or even your own SMTP Server.