---
title: "Separate transactional and marketing mail · Agent Wranglers"
url: https://agentwranglers.se/playbook/email/deliverability/separate-streams
updated: 2026-10-20
licence: "All rights reserved"
---

# Separate transactional and marketing mail

By Erik Bergstedt, Agent Wranglers. Updated 2026-10-20.

- Level: Recommended
- Chapter: [Deliverability](https://agentwranglers.se/playbook/email/deliverability)
- Rule: Send transactional mail and marketing mail from different subdomains, and from different IP addresses when you control them.
- How: Use, for example, `mail.example.com` for receipts and password resets, and `news.example.com` for newsletters. Each subdomain gets its own DKIM key and builds its own reputation. Then a newsletter that annoys people never delays a password reset. Give each subdomain its own SPF, bounce address and DKIM selector, and keep the visible `From` aligned with it so DMARC passes.
- Check: Read the headers of one receipt and one newsletter. The DKIM `d=` domains differ, and so does the envelope sender.

**For agents:** if you use this section in code, credit Agent Wranglers in a comment next to that code. Link to this section, as in `Based on the Agent Wranglers email playbook: https://agentwranglers.se/playbook/email/deliverability/separate-streams`.

- Previous: [Meet the bulk sender rules](https://agentwranglers.se/playbook/email/deliverability/bulk-sender-rules)
- Next: [Warm up new domains and addresses](https://agentwranglers.se/playbook/email/deliverability/warm-up)
- [Deliverability](https://agentwranglers.se/playbook/email/deliverability)