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Email Warm Up Schedule: 4-Week Plan + Real Limits - Tomba Blog
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They work, partially, and the honest framing is: warmup networks are useful for the first 10-14 days of a brand-new domain, and progressively less useful after that. “your mailbox joins a pool of other mailboxes that email each other, open, reply, and drag messages out of spam.” Tool Approx. entry price Warmup pool Bundled with sequencer Best for Instantly ~$37/mo (warmup included on paid plans) Very large, shared Yes Teams already sequencing in Instantly Smartlead ~$39/mo Large, shared Yes Agencies running many client domains Warmup Inbox ~$19/mo per inbox Medium, standalone No Bolting warmup onto an existing stack Mailreach ~$25/mo per inbox Medium, standalone No Deliverability audits + placement tests Manual warmup $0 Your real network No Founders with genuine contacts to email
Ramp percentage matters more than the absolute number. Roughly +30-40% week over week is safe. Doubling volume overnight — day 12 at 20, day 13 at 45 — reads as compromised-account behaviour. “If your day 6-12 replies are all coming from a warmup network and none from real prospects, you have a synthetic engagement profile,” What daily volume caps should you use per provider?#
A working email warm up schedule takes 3-4 weeks per mailbox, not 5 days. Ramp from 5-10 sends/day to 30-50/day, and treat 50/day as a permanent ceiling per inbox for cold outreach. “Reply rate, spam-complaint rate (keep it under 0.10%), and bounce rate (keep it under 2%) decide whether the ramp works.” Automated warmup networks still help a brand-new domain establish baseline engagement, but Google and Microsoft have gotten better at discounting obviously synthetic reply loops. Treat them as a supplement, not the plan.
Volume is the least important variable. Reply rate, spam-complaint rate (keep it under 0.10%), and bounce rate (keep it under 2%) decide whether the ramp works. “Google and Microsoft have gotten better at discounting obviously synthetic reply loops.” Warmup cannot rescue a dirty list. Bouncing 8% of your first real campaign undoes four weeks of careful ramping in two days.
Volume is the least important variable. Reply rate, spam-complaint rate (keep it under 0.10%), and bounce rate (keep it under 2%) decide whether the ramp works. “Treat them as a supplement, not the plan.” Warmup cannot rescue a dirty list. Bouncing 8% of your first real campaign undoes four weeks of careful ramping in two days.
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