Xavier Coiffard recommends a two-lane cold email setup with Google Workspace as primary and shared SMTP as secondary, specifying inbox counts, send limits, registrar spread, and warmup time.
Best cold email infra combo:
Google Workspace (primary) + Shared SMTP (secondary)
→ 3 inboxes per domain
→ 15-25 sends per inbox
→ 14-day warmup minimum
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