How to choose cold email software.
The ten things that decide whether a cold email tool gets you replies or gets your domain burned, and what to ask before you pay.
Most cold email tools look alike on their home pages. The differences that matter show up after a few weeks: in your reply rate, your bounce rate, and whether your domain still reaches the inbox. These ten questions tell them apart.
1. Does it send from your own mailboxes?
Cold email should go out through your own Google Workspace, Microsoft 365 or Zoho mailboxes, not a shared bulk-sending server. Check that you can connect several mailboxes and that there's no fee per mailbox.
2. Does it spread sending through the day?
Sending 50 emails in five minutes looks like a bulk blast. Good tools spread each mailbox's daily emails across a sending window, with random gaps.
3. How does it protect new mailboxes?
Ask what happens on day one. A safe tool starts new mailboxes at a low daily volume and raises it over a few weeks. Be careful with tools that rely on warm-up networks: Google pushed GMass to shut down its warm-up in 2023, and in 2026 the Heatwave blocklist began listing domains for artificial warming. See why we don't do warm-up.
4. Does it check your list before sending?
Bounces hurt fast. The tool should leave out addresses that can't receive email, throwaway inboxes and team addresses like info@ before anything is sent, and pause campaigns automatically if bounces spike.
5. Does it help with SPF, DKIM and DMARC?
Google and Yahoo require them for bulk senders. A good tool checks your DNS and tells you the exact record to add for your provider. Our guide: SPF, DKIM and DMARC.
6. Are the open rates honest?
Apple Mail and company security scanners "open" emails automatically. If a tool counts those, your open rate looks great and means nothing. Ask whether machine opens are filtered out.
7. Where do replies go?
With many mailboxes, you need one inbox for all replies, with labels, out-of-office detection, and the sequence stopping when someone replies.
8. Can you see what each lead will get?
Personalisation errors are embarrassing. Look for a preview of every step for a real lead, and a test email before launch.
9. Does it work with your other tools and with AI?
Check for CRM sync (HubSpot, Salesforce), webhooks, a full API, and an MCP server if you want AI assistants to manage campaigns for you, and whether these cost extra.
10. Is the price simple?
Watch for per-mailbox fees, contact limits, and features locked to higher tiers. If you're in India, check for rupee billing, UPI and GST invoices.
A quick scorecard
| Question | GTM and Outreach |
|---|---|
| Own mailboxes, no per-mailbox fee | Yes, unlimited |
| Sending spread through the day | Yes, smart scheduling |
| New mailbox protection | Slow start: 10, 20, then 30 a day |
| List checks before sending | Yes, on every upload |
| DNS help per provider | Yes, with exact steps |
| Machine opens filtered | Yes, shown but not counted |
| One inbox for replies | Yes, the Master Inbox |
| Preview and test before launch | Yes, launch waits for a test |
| API, MCP, CRM | Included |
| Price | One plan with everything included |
Use the same ten questions on any tool you're considering. The answers matter more than the feature lists.