Hi, right now I tried a subscription and as you said I got the welcome message directly. This is strange if you set the double opt in… is your blog a standard installation (not a multi site installation)?
If you want provide me an administrative access I can check the whole configuration because the subscription process is really simple and the double opt in should never send a welcome email.
If you want, send the credentials to my personal email: stefano@satollo.net.
Thank you, Stefano.