| DOUBLE OPT IN is just a concept so that you should verify the subscription twice before adding them to your mailing list. With MailCommunicator, you can follow this step:
1. Create a Message rule like this:
If "Subject" line contains "Subscribe" then send reply a message with a specify Subject(such as "Please confirm your subscription").
2. Then you create a second message rule like this:
If "Subject" line contains "Please confirm your subscription" then add email address to the mailing list.
As you can see, when the user subscribe to your mailing list at the first time, it does not add him to the mailing list, instead, it will send a confirm email, so that he need to reply to the confirm email then you add them to the mailing list.(Double opt-in).
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