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enable single mail option

Hi, i m facing problem to send mass email to contacts in Dev Org but error is thrown

"NO_MASS_MAIL_PERMISSION, Single email is not enabled for your organization or profile. Single email must be enabled for you to use this feature"


I believe in the developer instance you can't do mass email.............


One more point is at the profile level you need to have Mass Email checkbox is checked


You need to enable Email Deliverability on your sandbox.


Dear Salesforce, This souldn't affect unit tests.