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how to send an billions of emails to contact obejct using Batch apex

i need to send a Billions of emails to contact using Batch Apex .i am New in Salesforce Apex . how can do this Batch Apex for MassEmail to Contact. please help me .......................

Andy BoettcherAndy Boettcher

(Please don't crosspost)

 

Salesforce is not designed to do this.  You will need to use a 3rd party marketing solution such as Marketo.