How Lyris List Manager Decides Who to Unsubscribe
There are four ways to unsubscribe from a Lyris List Manager mailing list:
1) Enter the web interface, and press the "leave" button.
2) Send the command "unsubscribe listname" to lyris@your-server-name.com.
3) Send the command "unsubscribe listname your-email-address" to lyris@your-server-name.com.
4) Forward any posting you receive from a mailing list to the unsubscribe-listname@your-server-name.com address.
If an unsubscribe request is made with the "unsubscribe" command sent to lyris@this-lyris-server.com, as in "unsubscribe jazztalk", then the person named in the From: field is unsubscribed. If the
email address named in the From: field is not a member, Lyris List Manager returns a message to that person saying that they could not be unsubscribed.
Lyris List Manager also provides the option of naming an email address on the "unsubscribe" command line, such as the command "unsubscribe jazztalk bob@somewhere.com". In such a case, if unsubscribe
confirmation are enabled for the list, then a confirmation message is sent to the subscriber, then ensure that they are same person and not that someone else is trying to unsubscribe them.
When mail is received at the "unsubscribe-listname@…" address, Lyris List Manager tries to determine who the subscriber is and automatically removes them. In most situations,
this works very well.
The Lyris List Manager unsubscribing logic for unsubscribe requests received at the "unsubscribe-listname@…" is fairly sophisticated, and here is how it works. When Lyris List
Manager receives a message to the "unsubscribe-listname@…" address, Lyris List Manager goes through the following steps:
1) First looks for X-Lyris-Member-ID in the header. If it's there, that's who gets unsubbed. This catches almost all cases, except when the forwarding program strips out the headers (such as in
this example).
2) Looks for a purgeid tag in the header (X-Lyris-To:) and then in the body. If it's there, that person gets unsubbed. Note: purgeid tags are "cleaned up" before they are re-posted to a list (i.e.,
in quoted message), by removing the square brackets. In the example below, the square bracketed email address clearly identifies "wantsoff", so that who gets unsubscribed. Also note that MS-Mail
generated addresses with the text [SMTP:...] are correctly skipped by Lyris List Manager as of version 2.5 beta 3 (in earlier versions this Microsoft Mail behavior cause a false positive hit).
3) Look at the Return-Path (the MAIL FROM:<> sender), and see if it's a member. If it is, then this is likely a forwarded message, and unsub that person. Pegasus Mail does this.
4) Finally, if none of the above is valid, the person named in the From: header is unsubscribed.
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