How many domains should I use?

The right number of domains balances volume needs against management overhead.

General guidance:

Low volume (under 100 daily): 1 to 2 domains

Medium volume (100 to 500 daily): 2 to 4 domains

Higher volume (500+ daily): 4 to 6+ domains

Factors to consider:

Target sending volume and per-domain limits

Risk tolerance (more domains = more isolation)

Management capacity for warmup and monitoring

Budget for domain registration and maintenance

Per-domain volume limits:

New domains: 20 to 50 emails daily maximum

Warmed domains: 50 to 150 emails daily typical

Divide target volume by safe per-domain limits to estimate domain count

Common setups:

2 to 3 domains for most small to medium operations

4 to 5 domains for moderate scale

6+ domains for high-volume operations

Quality over quantity:

Better to have fewer well-managed domains than many neglected ones

Each domain needs authentication, warmup, and ongoing monitoring

Domain proliferation without management creates new problems