I managed to solve the problem – it came down to the theme_mods_xx field.
It is a serialized array, and my database search&replace was modifying the serialized array, which caused it to be invalid.
By unserializing, and then editing the WP URL to the new WP URL, and then reserializing, the issue was solved.
Thanks for the plugin recommendation, if it handles the serialized arrays this way then it would also be a solution.
I was afraid of that 🙂
Thanks for the response!
I also didn’t see anywhere in the docs what would happen when mailchimp isn’t configured. I did see in the code it does a standard plaintext email.
If you plan on a premium version of the plugin it would be a useful feature to be able to customize that email.
Thanks again!
It’s in your htaccess file – scroll far to the right to see the 301 redirects that send them to that site