Exactly. The admin, I believe, sets initial preferences regarding the sending of email upon initiation of a conversation. Therefore, if set, an initial "welcome" conversation by the system would automatically send an email message to the user's registration email address.
If I'm wrong on this, please let me know, and I will also configure the email welcome letter.
But the user doesn't set this; the admin does. So at least in the beginning, the welcome conversation will send an email if the admin has set up the board to send email upon initiation of a conversation. If I'm wrong, let me know.
Right. So if the admin does have that set, then there should be no reason to configure both the welcome conversation and welcome email. In fact, if both contain essentially the same information, having both configured may represent an annoyance for the user, which obviously would be bad, since first impressions are so important.
I know that I've registered at vbulletin forums in which I've received both a welcome PM and a welcome email message, which raised red flags for me.