Is there a way to prevent the Users from sending a duplicate email from Case Email related list? I already checked a Salesforce article regarding this.

Duplicate email sent

I want to make the Send button to be disabled once the User already clicked it once. But standard related list is not customizable. I know that lightning experience has already this function but the users are only using classic as of now.

I want to know if there is another way from preventing the User of double sending an outbound email message like this.

The highlighted emails are the same

Thanks in advance!!


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