What do you use to send OTPs and notification emails?

Genuine question for the devs here 👇

What are you using to send your app's OTPs, password resets, and notification emails?

Resend? Postmark? SendGrid? Self-hosted? Plain SMTP and a prayer?

I ask because I kept hitting the same two problems:

1. The pricing adds up fast once you're sending real volume.
2. Deliverability, half the battle is just not landing in spam.

For context, I ended up building my own: Sendhiiv — a faster, cheaper, Naira-friendly alternative to the usual options. Drop-in SMTP or API, and it auto-pauses a send if bounces or spam complaints spike, so your domain doesn't get wrecked.

But I'm genuinely curious what everyone else is running with, drop yours in the comments. What do you use, and what made you pick it? 👇