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Hello, as Amit_Shinde said :

Contact Date : the date when the server starts the send of the delivery (can be scheduled in advance on delivery parameters)

Last Modified : as a lot of Campaign objects, is the date when the elements has been modified (i.e : the line on the table has been modified, with at least 1 column change). This date change during several time after the last message : the recipients activity lasts weeks (months ?) and new trackings appear (open, click etc.), so the delivery indicators are updated, impliyng a lastModified update.

 

If you want to know when your workflow created the delivery, you should look at the "@created" field, this is the real date of creation of a delivery (and a lot of other things in Campaign)

(beware : if you use the "continous delivery" mode, this won't be true)

 

Cedric

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