I have a limit of 500 emails per day but can send only 300 emails, as duplicate emails get sent to the same contact. How can I prevent duplicates from being sent while sending mass emails?

I have a limit of 500 emails per day but can send only 300 emails, as duplicate emails get sent to the same contact. How can I prevent duplicates from being sent while sending mass emails?

You can prevent duplication by enabling a duplicate check for the email address as a unique field. Follow these steps to enable the duplicate check:
  • Go to Setup > Customization > Modules and Fields.
  • Select the Leads module.
  • Go to the Email Address field, click More [...] and select Do not allow duplicate values.
  • Click Save. 
You can now avoid duplicate email addresses.

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