Identical messages sent to multiple segments or lists by the administrator through the administrative web interface are always allowed. However, members are going to only receive one copy of the message if Cross-Postings and Duplicates are set to Make Sure That Multiple Copies of Cross-postings Are Removed.
Allow Duplicate Postings:
A duplicate posting occurs when one person attempts to post a seemingly identical message to the same mailing list or segment more than once in one day
Note
This setting only applies to messages received via email or posted through the discussion forum interface. Duplicate postings by an administrator through the web interface are always allowed.
ListManager looks at the entire message body to determine if a posting appears to be a duplicate
Note
If duplicate postings are sent in multipart-alternative format, the content of the message may be the same but the boundaries may differ, causing a seemingly duplicate posting to be sent
Normally, duplicate postings are the result of the author not being careful and sending the same message twice, or of some Internet mail error where the same message is delivered twice
It is recommended to leave this setting as default since there usually is no good reason why your list members are going to want to receive the same message twice. Also, this feature is quite effective as a mail-loop prevention technique, when people attach a misbehaving automatic email answering program to their email address.
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 is a single message sent to more than one mailing list or segment 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
Note
Messages are compared with others posted to the list in the past 24 hours. Older postings are not considered
Archives must be kept for at least one day for cross-posted messages to be removed
By default, email marketing and announcement allow cross-posting, but discussion lists do not. If Allow Cross-posting? is set to No, ListManager catches a cross-posted message, notes that it has already been posted to another list, and rejects any further attempts to post the identical message. If the message is modified slightly in some way (that is, an extra space, a carriage return, an extra sentence, and so on.) it is not 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 emails. However, there are many circumstances where it is appropriate. For example, if there are two mailing lists or segments that deal with related topics, and messages appropriate to both groups are written, the author may want the message to be distributed to both mailing lists
Note
This setting only applies to messages received via email or posted through the discussion forum interface. Cross-posting is always allowed by the administrator through the administrative web interface.
Cross-Postings and Duplicates
If cross-posting is allowed, this setting determines what members of multiple lists or subsets are going to receive the message.
Note
Archives must be kept for at least one day for cross-posted messages to be removed.
By default, members do not receive duplicate cross-posted messages.
For example, if a message is posted to two lists or segments and one person (one email address) is a member of both those lists or segments, the person receives one copy of the posting, because the setting is Make Sure that Multiple Copies of Cross-Postings are Removed.
Note
If you have a parent/child list relationship and you also want to have cross-posting enabled and no duplicates sent to members, you need to allow for Cross Posting under Utilities > List Settings > Basic Information > Enable Features along with Make Sure that Multiple Copies of Cross-Posting are Removed chosen. Also, you should not put child list members in the parent list. Only the child-list-posting address should then be added to the parent list members, so as to avoid multiple copies being sent to child-list members
However, there may be situations where you want people to receive copies as posted to the lists or segments. If that is the case, change this setting to "Cross-Posted Copies Should be Sent to Recipients as Listed."
This example explains how this feature works. Say you have several announcement lists where you post articles about various topics. You have lists named computers, cooking, gardening and sports. People join the various lists that they are interested in. Some people join just one list, while others might join several lists.
Now, say that you have an announcement about a video game for playing soccer and you feel that it is appropriate for both the computers list and the sports list.
If you post your message to both sports and computers (that is, you are Cross-posting your announcement) people who are members of these two groups are going to receive your announcement.
If you are set to Cross-Posted Copies Should be Sent to Recipients as Listed, then someone who is a member of both sports and computers are going to receive two copies of your message, one from each mailing list.
If you are set to Make Sure That Multiple Copies of Cross-postings Are Removed, then someone who is a member of both sports and computers is going to receive only one copy of your message. They receive the message from the first group you sent the message to. Thus, if you posted your message To: soccer, computers then the soccer messages are distributed first and that is where the person is going to get their message from.
This feature is particularly useful with announcement lists where you want to split your lists into various topics, but you have messages that apply to several topics. With other list managers, people receive multiple copies. With Aurea List Manager, the duplicate messages are removed and people receive only one copy.
This feature works the same way when sending to multiple segments. For example, if you want to make an announcement to all administrators on your server. When selecting recipients for a mailing, you may select the administrators segment for each list. If your lists are set to Make Sure That Multiple Copies of Cross-postings Are Removed, your administrators are going to receive only one announcement, regardless of how many lists they are members of.
