What Letteros works with

• Sending

  Flows and campaigns send through the connected service. Without one, emails go out through the Letteros Sendsay account.

  • Sendsay
  • UniSender Go
  • Mailgun (US and EU)
  • Mailchimp Transactional (Mandrill)
  • Mailganer
  • Your own SMTP
  • Project Telegram bot

• Export to your sending platform

  Download an email as an HTML file or an archive with images. “HTML with Letteros analytics” already has an open pixel, tracked links and a recipient ID placeholder for your platform.

  • Mindbox
  • Sendsay
  • Altcraft
  • Customer.io
  • Custom placeholder

• Stats from sending platforms

  Campaign reports from these platforms are loaded into Letteros Analytics from an export, next to the project’s emails.

  • Mindbox
  • Altcraft
  • Sendsay

• Leads from sites and forms

  A lead from a Letteros site or form goes to your CRM with the page UTM tags. The form submit counts as a goal in Yandex Metrica and Google Analytics when the counter is on the page.

  • Bitrix24
  • amoCRM and Kommo
  • Signed webhook
  • Yandex Metrica
  • Google Analytics 4

• Code on your site

  Add analytics counters, pixels and live chat code to the head or the end of a site built in Letteros.

  • Yandex Metrica
  • Google Analytics
  • VK pixel
  • Meta pixel
  • Jivo
  • Bitrix24 chat

• Mockups

  The Figma plugin sends a mockup to the site editor, and the site is built from it. An AI agent builds an email from a Figma mockup or a screenshot.

  • Figma

• Inbox previews

  The inbox previews button shows the email the way recipients will see it, before you send.

  • Mail.ru
  • Yandex Mail
  • Gmail and Gmail dark mode
  • Outlook
  • Apple Mail
  • Mobile mail apps

• Telegram

  Sign-up and login codes come from @letterosbot, and you can invite a colleague by Telegram. The project bot sends campaigns and receives customer messages.

  • @letterosbot
  • Project bot

• AI agents

  ChatGPT, Claude, Claude Code and Cursor connect to Letteros over MCP and build emails, decks, websites and campaigns on their own.

  How to connect an agent

Integration questions

Can I upload an email straight to Mindbox or Sendsay?

Download “HTML with Letteros analytics” and upload it to your platform. The recipient ID placeholder is already set up for Mindbox, Sendsay, Altcraft and Customer.io, and you can set your own for other platforms.

Do I need a separate sending service?

No. Without a connected service, emails go out through the Letteros Sendsay account. If you already use Sendsay, UniSender Go, Mailgun or your own SMTP, connect it in Flows.

How do website leads reach my CRM?

Pick Bitrix24, amoCRM or a webhook in the form settings. The lead goes to the CRM right after submit, with the page UTM tags.

What if an integration is missing?

Write to support: the list grows with customer requests.