billionmail

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g-shevchenko / email-warmup-stack

Build your own self-hosted email warmup + cold-email deliverability stack (BillionMail + a Gmail-inbox warmup loop via the Gmail API). The whole methodology, ~$45/yr vs $360–1200/yr for Instantly/Smartlead. MIT.

outreach gmail smtp spf dkim dmarc email-deliverability cold-email email-warmup billionmail

Updated Jun 20, 2026

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