I have the same problem as described here: https://wordpress.org/support/topic/second-subscription-no-welcome-mail/

I use free downloads as incentives for newsletter signups. I provide those download links in the welcome e-mail instead of the subcribers' confirmation page, so subscribers have to make sure they actually receive my e-mails.

Now sometimes people forget that they're already subscribed. If they subscribe again they're guided through the confirmation process without any indication that they're already subscribed - but don't get the welcome e-mail again. They don't even get the welcome message again when they unsubscribe first and then re-subscribe. I've actually been accused of fraud by angry (re-)subscribers.

Could this be fixed please, to allow duplicate welcome e-mails at least as an option?