Choosing between sending all your email from a single domain or splitting campaigns across subdomains can make or break your deliverability — and your revenue. Here’s a short breakdown on how each approach works, pros and cons, and how ESP limitations might affect your decision.

Finding the right email frequency can mean the difference between growing ARPU and burning your list. This guide breaks down data-driven strategies, segment-specific cadences, and benchmarks to help app marketers optimize send rhythm for revenue — not just engagement.