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Cold email deliverability in 2025: what's changed and what works

cold_email_king

Google and Yahoo's sender requirements crushed a lot of cold email operations in 2024. Here is what is still working in 2025.

What changed

  • Bulk sender requirements (5,000+ messages) now require one-click unsubscribe
  • Spam complaint rates above 0.1% trigger throttling
  • DMARC enforcement is stricter

What works

  • Using a separate domain (subdomain or new domain) for cold outreach
  • Warming up slowly (2-4 weeks minimum)
  • Keeping volume under 100/day per domain
  • Hyper-personalization (not just first name — reference specific company details)
  • Plain text emails that look like genuine 1:1 messages

The era of blasting 1,000 generic cold emails per day is over. Quality over quantity is the only sustainable approach.

#cold-email#outbound#deliverability
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4 Comments

deliverability_danDeliverability Expert

Using a separate domain for cold outreach is essential. Never send cold email from your main domain — one spam complaint can tank your entire program.

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cold_email_king

Hyper-personalization is the key differentiator now. Generic cold emails get flagged instantly. Research each prospect and reference something specific.

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b2b_brian

100 emails per day per domain is a good ceiling. We tried 200 and started seeing throttling from Gmail within a week.

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warmup_will

The warm-up period is crucial. We rushed it and destroyed our domain reputation. Had to start over with a new domain.

11