Likely depends on the service. About a month ago I got a 'still interested?' email that I could click on a link to say I was. Looks like they were using Conve

Likely depends on the service. About a month ago I got a 'still interested?' email that I could click on a link to say I was. Looks like they were using ConvertKit. Issues with email tracking has been a known issue for over a decade, so you would hope they would have that as part of their service. Might be worth using a test email to try it out.