What this is
A guide to creating a subdomain for safer sending.
Why it matters
Subdomains allow you to isolate sending activity and protect your main domain.
What to do
Go to your domain DNS settings
Add a new subdomain (e.g. mail.yourdomain.com)
Configure SPF, DKIM, and DMARC for the subdomain
Use this subdomain in your sending platform
Best practice
Use different subdomains for:
Cold email
Marketing campaigns
Transactional emails
Expert insight
Subdomains let you scale while containing risk.