Where to Buy Inboxes for Cold Email (and What to Actually Look For)

“Where do I get inboxes for cold email, and what should I look for?” It’s the most common beginner question in cold email, and most answers are either a one-word provider name or a pitch. Here’s the actual decision framework.

Step 1: pick the platform first

The platform drives price and deliverability more than the brand does.

• Google Workspace (GWS): the strongest inbox placement, but the most expensive and the most aggressively suspended for cold use. Best when deliverability matters more than price and volume is moderate.
• Microsoft 365 / Outlook: much cheaper at scale, solid if your prospects are on Outlook, but placement is more variable.
• Private SMTP: the cheapest per inbox and built for volume, but it isn’t real Google or Microsoft, so you trade some placement for the savings, and it’s less forgiving.

Most experienced senders mix: Google for high-value segments, Outlook or SMTP for volume. Match the channel to the value of the prospect. The provider comparison lets you filter the directory by platform so you can see who offers what.

Skip Zoho (and free tiers) for cold

A common beginner move is reaching for Zoho or a free tier to save money. Zoho is fine for normal business email, but it isn’t built for cold outreach and tends to crack down on it. Free tiers won’t land. For cold, stick to Google, Outlook, or purpose-built SMTP.

Self-create vs buy from a provider

You can create Workspace or Outlook accounts yourself, but doing it in bulk for cold email gets flagged and suspended fast, and you have to handle 2FA, app passwords or OAuth, and DNS on every account. Most people use a provider that provisions the inboxes with SPF, DKIM, and DMARC already set up, and replaces inboxes when they burn. You pay more per inbox than pure DIY, but at any real volume the time saved and the lower suspension churn usually make it worth it.

The five things to check before you buy

1. Platform: real GWS/Outlook vs private SMTP (see above).
2. Shared vs dedicated IPs: shared is fine until you send consistent high volume. A dedicated IP only helps once you can keep its reputation warm, so don’t pay the premium early.
3. Warmup included or add-on: many providers sell warmup separately. Factor it into the real cost, and warm 2-3 weeks before sending either way.
4. Replacement policy: when a domain burns, does the provider replace it free, and with a decent TLD? This is the detail beginners skip and regret.
5. Real price at your volume: watch volume discounts and whether warmup is bundled.

How many inboxes per domain

Keep it to about 2-3 inboxes per domain. The cheaper way to scale volume is more domains, not more inboxes per domain. And always run cold from separate domains, never the one holding your real business email, so a burn never touches your primary inbox.

A note on budget

If you’re starting with a small budget, be realistic: a hundred dollars is a learning budget, not agency scale. It’s roughly a handful of inboxes for a month plus a warmup tool. Start small, learn the setup, then scale once you’re actually getting replies.

Fair price per inbox

Rough bands: private SMTP is the cheapest (often well under $3), Google Workspace from specialist providers tends to land around $3-4, and pre-warmed or dedicated-IP options run higher. If you’re paying GWS retail (around $6+) for cold inboxes, you’re overpaying versus the specialists.

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Next steps: compare every provider by platform, price, and IP model, learn how warmup actually works, and find out whether links in cold emails hurt deliverability before you write your first campaign.