Custom Field

These fields enable users to run personalized campaigns, which gives campaign recipients a feeling that the user knows them and is aware of their business needs. This, in turn, helps to generate more responses for the campaign.
The user can add up to 50 personalization fields (5 default fields and 45 users -created custom fields) in a campaign message.
The personalized fields are replaced by the content stored in the Recipient Field when the Email/Sms Campaign is send.

Figure : Custom Field Management