How can I be certain my Email Messages were delivered?

ListManager will not consider a message successfully delivered until the receiving mail server has responded with a code indicating it was successfully accepted. If that doesn't happen, ListManager will continue to retry the message at the interval set in the retry schedule, and for the number of retries specified.

The progress that a posting is making can be seen in the web interface by clicking on Mailings: Mailing Status: All Outgoing Mailings by Date, and then selecting the message in question. This screen displays the number of addresses that have received the message, as well as the number that have had transient delivery problems. It also shows how many times ListManager has retried the message, and allows you to set the message to "Done".