MailChimp Forgotten Email Not Subscribed

An email address that is not currently subscribed to the MailChimp list was provided, as indicated by the error message “MailChimp.Net.Core.MailChimpException: Title: Forgotten Email Not Subscribed.” The MailChimp API, which is being used in a.NET Core application, is the source of this error message. The error message implies that either the subscriber has unsubscribed from the list or the email address used to try to subscribe is not in the list.

The solution is to re-subscribe a permanently deleted member, you can follow the following blog to fox the above issue:

After re-subscribing the permanently deleted member the issue will be fixed.

Alternatively, “MailChimp.Net.Core.MailChimpException: Title: Forgotten Email Not Subscribed” error can also occur when you try to add an email address to your MailChimp list. To resolve this issue, follow these simple steps:

  • Before you add an email address to your MailChimp list, make sure it is valid by verifying that the address has not already been subscribed to your list.
  • When you’re adding an email address to a list in MailChimp, make sure that the API key you’re using is valid and has the correct permissions for that list.
  • Check your MailChimp unsubscribe and complaint lists. If a user’s email address is on one of these lists, it means that he or she has previously unsubscribed from your emails or complained about receiving them. To verify this, you can go to the “Lists” section of your MailChimp account, select the list in question, and then click on the “Manage subscribers” button.
  • If you’ve followed all of the above steps and the error still persists, consider reaching out to MailChimp support for further assistance. They may be able to provide additional information or troubleshoot the issue.

By following the above steps, you should be able to resolve the “MailChimp.Net.Core.MailChimpException: Title: Forgotten Email Not Subscribed” error and should successfully be able to add an email address to your MailChimp list.