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Previously sent up to 2M cold emails per month, and I've been ask: How would you structure a cold email infrastructure for 25K emails per day. Here's my answer: 500 mailboxes (max. 50 emails per mailbox) 100 domains (max. 5 mailboxes per domain) Use a mix of Outlook and Gmail mailboxes...

Saw a post on X/Twitter from Vasco (a SaaS founder) saying: "we burned our startup's domain, every email is landing in spam, not just marketing emails, but transactional ones (e.g. login, updates etc..)" So, I decided to write up how I personally fixed it in the past to help anyone with the...