Cold email infrastructure is the set of secondary domains, mailboxes, authentication records, and sending tools used to run outbound campaigns without risking a company's primary domain.
How many emails can I send per mailbox per day?
Google Workspace allows 2,000, but for cold outreach 30 to 50 keeps you under behavioral thresholds.
Should I use Google Workspace or Microsoft 365 for cold email?
Both work. Workspace mailboxes tend to warm faster; Microsoft has stricter outbound spam filtering.
Why does cold email infrastructure matter for deliverability?
Cold outreach carries higher complaint risk. Isolating it protects the main domain's transactional and marketing reputation.
What is the first step to get started with cold email infrastructure?
Register 2 to 5 lookalike domains and redirect them to your main site.
What is the most common cold email infrastructure mistake?
Sending cold mail from the primary company domain.