Sometimes, messages sent to a Mailman list may be held until the moderator approves them, with the reason being that the “Message has implicit destination”.
This means that the message was forwarded or BCC:ed to the list’s address, instead of being sent directly to the list in the “To:” or “CC:”.
It’s generally considered dangerous to accept these kinds of messages; it sometimes leads to mistakes, so the Mailman default is to require that the original sender make their intention “explicit” by actually using the list’s real address in the “To:” or “CC:” address of a mail program.
However, if you really want Mailman to accept an “implicit” destination address, you can do that:
- Login to the Mailman list management pages for your site.
- Click Privacy options, then Recipient filters.
- Change the “Must posts have list named in destination (to, cc) field (or be among the acceptable alias names, specified below)” option from “Yes” to No.