If you are using the MailChimp service with the Post Office stack, and using more than just the email field, you will need to be sure to set up the the List Fields on the MailChimp website.
First thing you need to do is to login to your MailChimp account and go to the List you have set up. Once there, click on the settings tab and go down to List fields and *|MERGE|* tags
Once you do, you will see the screen below, depending on the number of fields you are using in Post Office, you will possibly have to add more fields in MailChimp. The screenshot below has all of the fields being used.
Email is always set up correctly, but as you can see from the screenshots, you have to use the following with the correct fields.
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