Skip to content

Email, written down

Guides, product notes and engineering stories from the team that runs Lettr's sending infrastructure.

Product · Oct 21, 2026 · 4 min read

For marketers: check, schedule, and send email campaigns from ChatGPT or Claude

ChatGPT and Claude connect to Lettr with one sign-in, and from the chat an assistant can report a campaign's results, build its segments, and schedule or send the campaign. This article covers the sign-in, what the assistant can do before and after a send, and the confirmation step before anything goes out.

Most read this quarter

  1. Why we built Lettr on Laravel Engineering · 6 min
  2. Best transactional email services in 2026, compared Fundamentals · 11 min
  3. Email attachment size limits by provider (and how to send large files) Fundamentals · 6 min
Compare Lettr with other providers

Latest

RSS

Set up a sending domain in four reads

The order we'd hand a new engineer setting up a sending domain.

  1. 01 SPF, DKIM, and DMARC explained for developers 10 min
  2. 02 How to warm up a new sending domain 9 min
  3. 03 Why you should separate transactional and marketing email 7 min
  4. 04 Email deliverability checklist 9 min
See how Lettr sets up SPF, DKIM and DMARC

All articles