How do I manage reputation across multiple domains?

Managing multiple domains requires systematic monitoring and balanced distribution.

Monitoring setup:

• Enroll each domain in Gmail Postmaster Tools
• Set up Microsoft SNDS access for each sending IP
• Monitor blocklists for each domain
• Track deliverability metrics per domain

Volume distribution:

• Spread sending evenly across domains when possible
• Don't concentrate volume on best-performing domain (burns it out)
• Rotate domains to give each rest periods
• Adjust distribution based on reputation indicators

Problem isolation:

• When one domain shows issues, reduce its volume
• Investigate root cause before shifting volume to other domains
• Don't let problem patterns spread across domains

Operational practices:

• Maintain consistent authentication across all domains
• Use separate mailboxes per domain for proper isolation
• Document which campaigns use which domains
• Plan for domain rotation and retirement

Each domain is a separate reputation asset. A fleet requires individual maintenance for each vessel, not just the flagship.