Configuring Postfix to Enable Digest Release by Email

To enable users to release the messages listed in their quarantine digests by email:

  1. Open the postfix/main.cf for editing.
  2. Set the following line:
    recipient_delimiter=+
If this is not done, postfix will look for a username something like "pmx-auto-approve+ffd3b6c7fa2c684f8d6fb1481d7e1297", which usually does not exist.