Where to Buy Warmed Cold Email Inboxes (Pre-Warmed Provider Guide 2026)
By Puzzle Inbox Team · May 19, 2026 · 7 min read
Looking to buy already-warmed cold email inboxes? Here are the providers selling pre-warmed accounts ready to send within 24-72 hours.
What "Warmed" Cold Email Inboxes Means
Pre-warmed (or "warmed") cold email inboxes are accounts where the provider has already run 2-3 weeks of warmup activity to build sender reputation before delivery. You receive ready-to-send accounts that skip the warmup phase that self-warmed inboxes require.
Why Buy Pre-Warmed vs Self-Warmed
Cost and time comparison for 30 inboxes over 6 months:
Self-Warmed Path
- 30 inboxes × $3 = $90/month
- Mailreach warmup tool: 30 × $25 = $750/month
- Total: $840/month, $5,040 over 6 months
- Plus 2-3 weeks of zero output during warmup
- Plus operational time for warmup management
Pre-Warmed Path
- 30 pre-warmed inboxes from Puzzle Inbox: $90-135/month
- No warmup tool subscription
- Total: $540-810 over 6 months
- Ready to send in 24-72 hours
Pre-warmed saves $4,200+ over 6 months and 2-3 weeks of setup time.
Where to Buy Pre-Warmed Cold Email Inboxes
1. Puzzle Inbox (Best Overall)
- Pre-warmed Outlook 365: $0.35/inbox/month (cheapest in market)
- Pre-warmed Google Workspace: $3-4.50/inbox/month
- 13,000+ active inboxes serving 300+ agency clients
- WhatsApp support with 15-minute response
- Both platforms (GWS and Outlook) from one provider
- Order: puzzleinbox.com
2. Mission Inbox (Enterprise Tier)
- Pre-warmed Google Workspace: $8-25/inbox/month
- Formal SLAs with credit guarantees
- Dedicated account management
- Best for Fortune 2000 with compliance requirements
- Premium pricing — only justified for specific enterprise needs
3. Email Astra (Mid-Tier)
- Pre-warmed Google Workspace mid-tier pricing
- Smaller scale than Puzzle Inbox
- Google-only (no Outlook)
4. MailPal (Bundled Warmup Model)
- Mailbox + warmup bundled at delivery
- Per-inbox pricing similar to budget providers but with warmup included
5. Some InboxRental Tiers
- Rental model with pre-warming included in some plans
- Monthly rental fees
- Useful for short-term flexibility
What to Verify Before Buying Pre-Warmed
- Verify pre-warming actually included: Some providers claim it but don't deliver
- Check warmup network size: Larger networks produce stronger reputation
- Ask about warmup duration: Standard is 2-3 weeks, longer better
- Check post-delivery warmup maintenance: Inboxes need ongoing warmup activity to maintain reputation
- Verify deliverability data: Provider should share aggregate reply rates, inbox placement
Pre-Warmed Inbox Pricing Comparison
| Provider | Outlook | Google Workspace | Pre-warming |
|---|---|---|---|
| Puzzle Inbox | $0.35/inbox | $3-4.50/inbox | Included |
| Mission Inbox | $15-25/inbox | $8-25/inbox | Included |
| Email Astra | — | $3-5/inbox | Included |
| Maildoso (self-warmed) | — | $2-4/inbox + $25 warmup | NOT included |
| Mailreef (self-warmed) | — | $3-5/inbox + $25 warmup | NOT included |
Pre-Warmed Inboxes for Different Operations
For Solo Operators (1-5 Inboxes)
Puzzle Inbox Outlook at $0.35/inbox = $1.75/month. Cheapest pre-warmed cold email infrastructure available.
For Small Teams (10-50 Inboxes)
Puzzle Inbox mixed: 70% Outlook + 30% Google = $20-50/month for 30 inboxes. Pre-warmed dual-platform covers most cold email use cases.
For Agencies (50-500 Inboxes)
Puzzle Inbox agency pricing. Bulk volume discounts. WhatsApp support critical for client operations.
For Enterprise (500+ Inboxes)
Puzzle Inbox enterprise + Mission Inbox backup for SLA-sensitive accounts. Diversified infrastructure.
Pre-Warmed Buying Process
- Visit provider website (e.g., puzzleinbox.com)
- Select plan tier and inbox quantity
- Provide preferred sending domain or use provider domains
- Submit payment via Stripe
- Receive provisioning timeline (typically 24-72 hours)
- Receive credentials and connection instructions
- Connect to sending platform (Instantly, Smartlead)
- Begin cold email immediately — no warmup wait
Red Flags When Buying Pre-Warmed
- Pricing too cheap to include real warmup ($1/inbox cannot include genuine warmup network costs)
- "AI-powered warmup" without specifics about warmup network size
- No public deliverability data or case studies
- Vague provisioning timelines
- No replacement policy in writing