This article will explain how to flag a contact in 123-mail webmail.
Flagging contacts allows you to add a visual identifier to your contacts, allowing you to to group them arbitrarily, as opposed to any other means of grouping. Follow the instructions below to see how to assign flags to your contacts:
Login to the 123-mail webmail.
Click on the Contacts icon in the main toolbar.
Click on the contact you wish to Flag.
Click on the Flags tab.
Click on the Flag you wish to assign to your contact.
You can then order your contact list by flag type by clicking in the header row of your contacts bar: