Cold Email Infrastructure: How to Set Up Domains and Mailboxes
Cold email infrastructure is the foundation that decides whether your emails reach the inbox or the spam folder — the domains, mailboxes, authentication records, and warm-up process behind every campaign. This is the complete setup guide: how many domains and mailboxes you need, how to configure SPF, DKIM, and DMARC, the 2-4 week warm-up ramp, and how to maintain sender reputation over time.