I just use Convert Kit for everything. They have templates, automation, and segmentation (in case you want to segment your list/tag subscribers later).

Are you trying to use email marketing later (upsell, cross-sell, nurture, etc) or is it JUST one waitlist?

I've been using SendPulse for years. I use it for waitlist capture, drip emails, newsletters, and many other things.

If you plan to use LemonSqueezy for payments, they also have an email collection.

Otherwise, all the mail providers will have this: CovertKit, Mailchimp etc.

I use Convertkit currently like @cat. But I'm considering migrating to Button Down instead.

I'm on Convertkit but considering moving to Customer IO since they gave startups 1 year free plan.

i'm using loops.so for collecting emails, marketing annddd transactional emails