Why use autocomplete=off on the sign up password field? It prevents password managers from autofilling a new password, and I can't be bothered to remember another password.
Perhaps I'm just absurdly cynical but getting a "Thank you" note for attending a meeting doesn't sound like a positive. At best it's neutral/just more email spam. At worst it feels condescending and/or childish.
So here's the deal: After any external meeting you get an email with thank-you links for each participant. Clicking on any of the links opens up a precomposed email that you can EDIT and APPEND TO before sending. And you should!
Clearly I'm biased - no way I'll be able to convince you follow-ups are awesome, given I'm trying to show off a tool making them easier :)
I suggest you talk to someone in a position where curating relationships is key - founders, growth, agents - and see what they have to say about follow-up emails!
I'd say the advantages are: Show gratitude, reduce the hurdle for the other person to ask questions/reach out via email in the future, summarize the most important points made, stay top of mind with the person...
Interesting idea - the name is a confusing choice though - doesn't seem representative of what the service actually is and there's already a well known startup called CircleUp