Re-subscribing the previously unsubscribed

Hi all - polling the crowd here!

Curious how others here handle resubscription of those that had unsubscribed at past points? We don’t have a verification email for first-time signups, but for anyone that had previously unsubscribed they receive a confirmation email that includes a verification button with a unique url link that they need to click in order to opt back in (otherwise they stay as subscribed - unconfirmed). No surprise but that email often gets lost or the contact doesn’t follow through with clicking that button … and then gets frustrated that they didnt get a zoom link for an event and things like that. 

Currently we query in CAL to find the "attempted to resubscribe but not confirmed subscribed" folks, and email them. But we want to make the personal followup with them as smooth as possible. We're trying to avoid the "please search your inbox for an email with the subject line X"  kinda note. Even better if we could get a copy of that original email with the unique URL too.

In contrast - for recurring payments, we have a triggered email that monthly donors receive when their gift fails. That trigged email "Sorry, we had trouble processing your monthly donation" is from my email address, with reply to my email AND I'm BCCed, so I receive a copy of it. It is incredibly helpful with followup communication to have that original copy of the email that I can simply respond to.

Those seem very similar to me, but I'm even though they're both triggered emails I'm sure there's something different on the back end. Curious how others approach this?

It’s particularly sensitive for contacts that clicked unsubscribe instead of manage your preferences - so get bumped from all our mailing lists, instead of just limiting themselves to a monthly newsletter. 

Thanks,
jeff