This setting determines if messages that are crossposted are
rejected by Lyris, or if they are allowed onto the list.
A cross posted message occurs when
a single message is to more than one mailing list on a Lyris 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, Lyris 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.
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, when messages appropriate to both
groups are written, the author may want the message to be distributed to both
mailing lists.