This problem normally occurs if people add Cc and Bcc addresses to their message, in addition to the address of your mailing list. Each Mailman list has a limit to the total number of recipients of a message, as an anti-spamming measure. The mailing list itself counts as one address. The default limit is 10, so if someone emails the list and copies to 10 other addresses (making a total of 11 recipients), this would trigger this error.
To adjust the limit for your list, follow these steps:
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This is question number 1168, which appears in the following categories: