Guides for sending email from your product.
Deliverability deep-dives, integration guides and the setup questions we are asked most, written by the team that runs SendByte.
- Why your app's emails fail on Railway, Render, and Vercel If your emails send fine locally but time out in production on Railway, Render, Fly, or Vercel, the cause is almost always blocked SMTP ports. Here is why it happens and the one change that fixes it for good.
- How to send transactional email in Nigeria: a 2026 guide A practical, developer-first guide to sending transactional email from Nigeria in 2026: API versus SMTP, domain authentication, deliverability to local inboxes, and paying in Naira instead of dollars.
- What dollar-billed email really costs African startups The sticker price of a US email provider is not what you pay. Add the exchange rate, the virtual card funding fee, and rate volatility, and the real Naira cost is higher and unpredictable. Here is the math.
- SPF, DKIM, and DMARC for Nigerian senders: a practical setup guide A no-nonsense walkthrough of SPF, DKIM, and DMARC for developers sending email from Nigeria, with real DNS record examples, a sane DMARC rollout, and the registrar gotchas that trip up .ng domains.
- Migrating off MailChannels: options for African developers MailChannels retired its free Cloudflare Workers email tier, forcing a migration on a lot of teams. Here is what to look for in a replacement and how to move your transactional email without dropping a message.
- Sending receipts and OTPs with Paystack and Flutterwave webhooks A practical pattern for sending payment receipts and one-time passcodes from a Nigerian app: verify the webhook, send the email, and get OTP deliverability right so the code arrives in seconds.
- Why your transactional email lands in spam, and how to fix it from Nigeria Your password resets and receipts are going to the Gmail spam folder. Here are the real causes, ordered by how often they are the culprit for African senders, and the fix for each.
Put it into practice.
3,000 free emails every month. No card required.