[Mailman] Send HTML Welcome Message

I run the CUDS list on this mailman server. I want to send out HTML welcome messages to new list subscribers. Currently, I only appear to have the option of sending out plain text welcome messages. I looked at this mailman list and it noted that a setting had to be changed on the server to enable this. Can this be done? I want to send a welcome message with a lot of links in it, that's why I want HTML. Presently, because it can't be sent automatically, I'm manually emailing it out to everyone who subscribes to the list which is a pain and means that too many people receive my personal address which opens me up to spam and viruses. Thanks.