To unsubscribe from an electronic discussion list:
Web interface method
Go to the ALA Mailing Lists home page; Log in.
Left click the title of the list to select it.
Choose the Unsubscribe command on the left nav bar.
Sympa will ask you if you are sure you want to Unsubscribe. Choose YES.
These directions can be used for any open ALA list, substituting the appropriate list name.
Compose a new message in your email, addressing it To: firstname.lastname@example.org.
In the body of the message, type: UNSUBSCRIBE LIST NAME, inserting the name of the list in place of LIST NAME.