How do unsubscribes integrate between v1 and v2/3?

On a high level, the way it works is that v1 unsubscribes get imported into v2/3 but not vice versa.

The reason we've gone that route is because for most customers that logic has made sense.  If someone unsubscribes from a triggered email (v1), we want to avoid sending them newsletters (v2/3) because in general triggered emails are more personalized than newsletters.

So if they don't want a triggered email, there's a good chance they definitely don't want a newsletter.

So if you export your unsubscribes from v1 and notice that you have less than the number of unsubscribes in v2/3, that would usually be normal.

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If you are interested in syncing the unsubscribes both ways, that's a setting that can be enabled on your account - just get in touch.