Smartlead’s 2025 guide distills cold-email best practices: write short, plain-text, mobile-friendly emails (~100–200 words) with 6–10-word subject lines; personalize (name, company, context) and focus on one clear CTA. Send at optimal times (often early Monday), avoid attachments, proofread, and make it about the recipient’s pain points. Follow up 3–4 times and track core metrics (aim: open >20%, CTR 2–5%, reply >10%, bounce <2%). “Pro” deliverability tips: 5-minute send gaps, maintain a DNC list, stop/repair campaigns if bounce >2%, remove weak mailboxes, check blacklist status, cap ~50 emails per address/day, ramp volume gradually, use spintax for variation, and rotate inboxes. Measure opens, replies, conversions, bounces, unsubscribes—and iterate.

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