The main purpose of libMailQueue is to provide a common interface for addons that want to send mail. This simplifies addon development and prevents different addons from trying to send mails at the same time, which could cause unpredictable behavior. This project merges code from SendRunes and zMailQueue and adds an API. One important feature is that if zMailQueue is installed, the zMailQueue GUI will show the mail queue, so you can verify that the mails are going to the right persons.