Subdomain Isolation & Phased Migration

The "lifeboat" strategy. If your main domain is "sinking," you can't save it all at once. This section covers the "pro" move of isolating your best mail (like transactional) onto a new, clean subdomain to get it flowing again while you repair the old one.

14 questions in this topic

How can using subdomains help isolate reputation issues? What is subdomain isolation? How can separating mailstreams prevent cross-contamination? If my main domain has poor reputation, can I switch to a subdomain? How should marketing, transactional, and cold emails be separated? What’s the difference between subdomain vs sub-brand isolation? How do ISPs view different subdomains under one root domain? What is a phased migration strategy for moving to a new IP/domain? How does this help with reputation recovery? How do you migrate safely from root to subdomain sending? How does authentication alignment change after subdomain setup? How can subdomain routing accelerate recovery? How to maintain historical reputation data during domain changes? How can hybrid routing protect main brand reputation?

Questions about Subdomain Isolation & Phased Migration