What is subdomain isolation?
Structure example:
- marketing.tidalmail.com - promotional campaigns
- transactional.tidalmail.com - receipts, confirmations
- alerts.tidalmail.com - system notifications
Benefits:
- Marketing problems do not affect transactional delivery
- Different warmup and volume per stream
- Clearer reputation monitoring per purpose
Setup requirements:
- DNS records for each subdomain
- SPF, DKIM, DMARC per subdomain
- ESP configuration for multiple sending domains
Management:
- Monitor each subdomain separately
- Different sending practices per purpose
- Maintain authentication for all
- Separate ships for different cargo types. Each builds its own reputation.
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