Allow Cross-posting

This setting determines if messages that are cross-posted are rejected by ListManager or if they are allowed onto the list.

A cross-posted message occurs when a single message is sent to more than one mailing list on a server. For example, in the To: field of an email message, the author can list several mailing lists and thus deliver the same message to several lists.

By default, ListManager does not allow cross-posting. It will catch a cross-posted message, see that it has already been posted to another list and reject any further attempts to post the identical message. If the message is modified slightly in some way (i.e., an extra space, a carriage return, an extra sentence, etc.) it will not be considered a cross-posting. Note that Archives must be be kept for at least one day for cross-posted messages to be removed.

In general, cross-posting to mailing lists is considered bad Internet etiquette and, occasionally, it is a method used by spammers to disseminate inappropriate email. However, there are many circumstances where it is appropriate. For instance, if there are two mailing lists that deal with related topics, messages appropriate to both groups are written, the author may want the message to be distributed to both mailing lists.