In email-to case, duplicate cases are created when the email is sent/cc'd several addresses (cc).

When I send an email to the email-to-case address AND to another person (in the cc of the mail), it creates 3 cases in Salesforce. (I don't know why 3... and the 3rd one is created several minutes after the first 2).

If I send an email only to the email-to-case address, it creates only one case.

Do you know how I can avoid this duplicate case?

* EDIT *

After some other tests, I see that some cases without cc are also created with duplicate... so it is not not the reason of the problem.

I tested to use the big email adress of the email to case (the normal email adress of the email to case redirect to this big email adress) and then I havn't the duplicate problem.

  • 1
    Has the person in the cc line replied to all? That would result in a second case being created since the email they're replying to doesn't have a case refId in the body. (It looks like two separate emails to the system.) The same can happen when one of the recipients has an automated reply (like "out of the office") turned on. Commented Oct 9, 2018 at 9:48
  • Do you have any workflows, process builders or triggers on Cases? Commented Jul 5, 2019 at 18:26

1 Answer 1


See the comments below this post: Email To Case - Duplicate Cases. I believe it provides a solution and answers your question on how to resolve the problem you are having.

You'll want to implement your Email Service with the appropriate Apex code logic, mainly adapted from the following post: http://sforcehacks.blogspot.co.il/2012/01/email-to-case-can-create-too-many-cases.html

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