Hi All, Scenario: Original id - 1. srividhya.mm@test.com - Marketo id: 1234567 is set as blacklist true Duplicate id - 2. srividhya.mm@test.com - Marketo id: 7654321 is not set as blacklist true When the target list is blasted with "srividhya.mm@test.com - Marketo id: 7654321",the email is actually sent, since marketo recognizes both email id as different due to different marketo id. But logically, its the duplicate email id of the blacklisted lead and marketo should not send the email. Question: Is there a way to set duplicate email ids to set blacklist as "true", when marketo finds one among the email id is blacklist "true". Please help to overcome this issue and steps involved (default if any available in marketo to set black list true for duplicate id / to achieve this through any smart list / smart campaign ) Thanks in advance! struerividhya.mm@test.com - Marketo id: 7654321

There may be a better way than this, but you could create a smart campaign with the following:Smart list - Member of Smart List, List = Possible Duplicates Blacklist = False (this will help prevent your campaign queue from getting backed up)Flow - Change Data Value - Blacklist = TrueThen schedule it to run nightly or prior to each email send you have.