Koltrix
Comparisons
Postmark Alternatives: Picking by What You Actually Need
Postmark is a strong transactional email service. If it's missing something you need, the right alternative depends on what that is. A fair guide by use case.
4 min read
GuidesSending Lifecycle Emails From Your Own Job Queue
For founders who code: build onboarding and trial emails with an events table, a scheduled job and an email API, with idempotency and suppression built in.
5 min read
GuidesEstimating Transactional Email Costs as You Grow
A practical method for forecasting how many transactional emails your product will send per month, and what that volume will cost as your user base grows.
4 min read
ComparisonsCampaign Builder or Email API? Where SaaS Lifecycle Mail Should Live
Campaign builders and email APIs solve different halves of lifecycle email. Who should own onboarding, trial and billing mail, and when a hybrid setup works.
4 min read
- Guides
Choosing a Transactional Email API: 12 Questions to Ask
Every transactional email API sends mail. The differences hide in webhooks, suppression, logs, replies and exit. Twelve questions to ask before you commit.
5 min read
ComparisonsAmazon SES vs a Managed Email API: Trade-Offs for Small Teams
Amazon SES is famously inexpensive per message. A managed email API costs more and does more for you. How to weigh price against engineering time.
4 min read
GuidesSwitching Transactional Email Providers With Zero Downtime
Moving your app's email to a new provider doesn't need a risky big-bang cut-over. Dual DKIM, a thin sending interface, gradual rollout and suppression export.
4 min read
- Comparisons
Resend, Postmark and SendGrid: Choosing a Transactional API
Three of the most common answers to how should our app send email, compared fairly: who each one suits, where each is strongest, and the questions to ask first.
5 min read