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Amy · 16 min read
What is an email API? And when to use one for your transactional email

An email API is a service that lets your application send email programmatically via code instead of a mail client. It handles delivery, tracking, and inbox placement behind a simple API call, and is the best way to set up email sending on your website, app or store.

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Duncan · 13 min read
How to warm up an email domain (plus full sending schedule)

Congratulations: you’ve got a new client that you need to send emails for. But before you hit send, make sure to warm up your domain first.

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Agathe · 16 min read
SMTP email queue: how it works, what causes backlogs, and how to fix them

When you send thousands of emails at once, the SMTP email queue is the unsung hero that keeps things from falling apart.

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Amy · 15 min read
Essential email DNS records and how to set them up

DNS records are what tell the internet's mail servers that you're a legitimate sender, and without the right ones in place, your emails may never reach the inbox.

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Amy · 12 min read
How to package transactional messaging as a managed agency service

Transactional messaging is a crucial part of the customer experience. Clients need it, they often don’t want to manage it themselves, and once you set it up, the ongoing workload is essential but minimal.

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Amy · 19 min read
Improve security with OTPs: Guide to one-time passwords

One-time passwords (OTPs) improve the customer experience and make apps and websites more secure by working to prevent hackers from gaining account access.

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Amy · 8 min read
How to send SMS text messages with PHP

You can use PHP to quickly and easily start sending bulk SMS messages to your customers in minutes. Here’s how to add SMS sending to your stack.

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Amy · 19 min read
The agency’s guide to multi-tenant transactional email

Transactional emails are the critical comms every website, app, and e-commerce store needs to function. In this guide, we’ll cover the driving concepts, tips, and best practices your agency can use to effectively manage the transactional email of multiple clients.

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Amy · 14 min read
IP vs. domain reputation: Why domains matter more in 2026

Domain reputation is becoming increasingly important for landing emails in inboxes. This means that significant spikes in sending can cause issues, even when the IPs being used are in good standing. In 2026, a bigger focus on domains is key.

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