Email Plugin Recommendation

Is there an html email plugin that I can use to send html emails to a list of emails? I have not been able to find one that doesn’t require me to import the email addresses as users.

I am trying to invite my subscribers from my old blogger blog to subscribe to my new WordPress blog, but haven’t been able to find the right plugin to do it. I don’t want one that requires me to import all of the email addresses to WordPress users because then I would have to go through and delete all of them before anyone signs up.

To sum it up, does anyone know of a wordpress plugin that will send html emails to a list of emails rather than my members. I could get away with importing the list as long as the email addresses didn’t import as members.