You are receiving this email because someone (presumably you)
subscribed $(email) to the $(maillist-name). Subscription
request was received from a network address of $(ip) on $(date).
If you did not request this subscription, or would like to be
removed from the maillist for another reason, visit this link
to unsubscribe - $(link).
1) Enter email on web page.
2) Open confirmation link in email inbox.
If you skip second step - there is a risk that email ends up in spam folder and is constantly delivered there.
Another risk - user did not really request your subscription. That would often result in your emails being marked as spam.