Configuring Postfix to Enable Digest Release by Email
To enable users to release the messages listed in their quarantine
digests by email:
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Open the postfix/main.cf for editing.
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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.