You can now use the JangoMail-assigned campaign ID or a custom-assigned campaign ID to personalize the Subject and Message of your e-mail campaigns.
To use the JangoMail-assigned campaign ID, use the variable %%MassEmailID%%. To use a custom-assigned campaign ID, use the variable %%CustomMassEmailID%%. Custom campaign IDs can be assigned by filling out the Campaign Identifier field on the Send E-mail page.
This feature may be useful if you want to tag links with campaign IDs for your own internal tracking/reporting system.