Use cases / Dev-tools / Developer APIs
Email for dev-tools / API products
When email is a product surface: API key verification, alerts, daily digests
Dev-tools and API products send a lot of email: API key verification, security alerts, billing notifications, daily/weekly digests. Sendersy gives you a Resend-compatible API and tooling for monitoring.
Pain points
- 1.Security alerts need 100% inbox placement, otherwise trust erodes. One bounce = lost user.
- 2.Send logs need to be queryable for debugging. Most ESPs hand them out async only.
- 3.Pricing scales unpredictably: $5 / 50k from one vendor, $90 / 100k from another.
How Sendersy solves it
- List-Unsubscribe + One-Click on every send (Gmail 2024 spam filter loves it). Auto suppression list.
- POST /v1/emails returns message_id immediately. Real-time email logs, full payload for debugging.
- Predictable pricing: ≈$20 for 50 000 emails/mo. No surprise quota spikes.
What the integration looks like
ts
// Security alert — must arrive
await sendersy.emails.send({
from: 'Acme Security <security@acme.com>',
to: user.email,
subject: 'New API key created on your account',
html: `<p>A new API key starting with <code>${prefix}…</code> was created from IP ${ip}.</p>
<p>If this was not you, <a href="${revokeUrl}">revoke immediately</a>.</p>`,
headers: {
'X-Priority': '1',
'X-Sendersy-Category': 'security',
},
tags: [{ name: 'category', value: 'security' }],
})
// On webhook event:
app.post('/webhooks/sendersy', verifySignature(SECRET), (req, res) => {
if (req.body.type === 'email.bounced') {
notifyOnCall(req.body.data) // critical: a security alert bounced!
}
})