Your cold email isn't reaching inboxes. You're doing everything right—crafting messages, building lists, timing sends—but they're bouncing, landing in spam, or disappearing entirely. The problem isn't your copywriting. It's your sender reputation and inbox placement.
A deliverability tool monitors and improves how email providers view you. It tracks open rates, bounce patterns, spam complaints, and sender authentication. It tells you what's working and what's tanking your ability to land in the primary inbox. Without one, you're flying blind.
The difference between a cold email tool and a deliverability tool matters: one lets you send sequences; the other ensures those sequences actually arrive. Most of the best cold email platforms now bundle both. But knowing what to look for—email warmup features, real inbox placement data, sender reputation monitoring—will save you from picking the wrong one.
# Clkly
Clkly is the simplest way to run cold outreach without killing your sender reputation. It combines link tracking with email warmup and real-time deliverability monitoring. You can send from Gmail or Outlook, track every open and click, and warm up new mailboxes automatically.
- Inbox warmup gradually ramps your sending volume up to full capacity, protecting new email accounts from spam flags
- Real-time open, click, bounce, and unsubscribe tracking tied directly to each contact
- Branded short links and styled QR codes let you track engagement without suspicious URL shorteners
- Branching email sequences with conditional logic and delays let you respond to recipient behaviour automatically
- Country-level analytics show where clicks come from, what devices opened emails, and which referrers matter most
# HubSpot
HubSpot is a full-stack CRM with email marketing, contact management, and deal tracking built in. The platform handles contact storage, lifecycle stages, custom fields, and basic email sending through both HubSpot's own system and third-party connectors. It's widely used by teams managing both inbound marketing and outbound sales work, though its cold email capabilities are lighter than dedicated outreach platforms. Pricing ranges from free (limited features) to enterprise, and the learning curve is steep for users who only need email.
# Lemlist
Lemlist positions itself as a cold email platform with AI-powered personalisation and campaign sequencing. It offers A/B testing, landing page builders, and open/click tracking for campaign analysis. Pricing is mid-market, starting around £50–100 per month. The tool is popular with agencies and inside sales teams running large cold outreach campaigns, though it requires more manual setup than some competitors.
# Instantly
Instantly focuses on high-volume cold email with multi-account sending and built-in warm-up. It lets you rotate between email accounts, set sending limits per mailbox, and track deliverability across multiple domains. It's aimed at teams willing to manage more infrastructure in exchange for scale. Pricing is competitive but the interface can feel cluttered if you're new to managing multiple sending accounts.
# Apollo
Apollo combines prospecting (a built-in database of millions of B2B contacts) with cold email sequences and engagement tracking. You can search for leads, import them directly into sequences, and monitor opens and replies in one place. It's designed for outbound sales teams that need both the list and the sending tool. Mid-market pricing; the prospecting database is a significant differentiator if your team doesn't already have a reliable source of leads.
# Salesloft
Salesloft is a sales engagement platform—meaning it spans email, phone, and task management for outbound teams. It includes cadences (sequences), open/click tracking, AI-powered reply detection, and integration with major CRMs. It's more expensive than specialist cold email tools but suits larger teams where multiple channels and CRM syncing are non-negotiable. The learning curve is substantial.
# Outreach
Outreach is another sales engagement platform, similar in scope to Salesloft. It covers sequences, tracking, AI-assisted workflows, and deep CRM integration. It's used by enterprises and growth-stage teams with dedicated sales operations. Pricing is high and requires a demo. The platform can handle complex multi-channel campaigns if your team needs that scale.
# Brevo
Brevo (formerly Sendinblue) is a marketing automation platform that includes email sending, contact management, SMS, and basic CRM features. It's positioned more towards marketing teams running nurture campaigns, though it does support cold email sequences. Pricing is affordable and straightforward. It's a jack-of-all-trades tool, so cold email capabilities are less specialised than dedicated platforms.
# ActiveCampaign
ActiveCampaign is a marketing automation and CRM hybrid with email sequences, contact scoring, and basic sales features. It's designed for teams running both marketing campaigns and lighter sales outreach. Pricing is mid-market. The platform excels at multi-touch nurture campaigns but is not built for high-volume cold email like Lemlist or Instantly.
# Close
Close is a sales CRM with built-in calling, SMS, and email. It's lightweight compared to Salesforce or HubSpot, and it prioritises speed of use over feature breadth. Email sequences and open/click tracking are present but secondary to the CRM core. Popular with inside sales teams and startups that want one unified tool. Pricing is relatively affordable.
# Mailchimp
Mailchimp is an email marketing platform first, CRM second. It's built for marketing campaigns, newsletters, and nurture sequences rather than cold outreach. It includes contact management, basic automation, and deliverability reporting. Pricing is free for small lists (with limits) and scales affordably. It's not the right fit if cold email is your primary use case, but it works well for warm email campaigns and list maintenance.
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If your priority is protecting sender reputation while running cold email, a dedicated deliverability tool with email warmup matters far more than having every feature under the sun. Most teams don't need a platform that does prospecting, calling, SMS, and marketing automation at once—they need something that lands emails, tracks engagement, and doesn't require a PhD to set up.
Clkly handles cold outreach the way it should work: send from your own mailbox, warm up new accounts automatically, track every open and click in real time, and run conditional sequences that respond to behaviour. You're set up in under a minute. No card required to start free.
- Send from Gmail or Outlook without losing native authentication and deliverability
- Automatic warmup keeps new mailboxes safe from spam traps
- Every link click and email open is tied back to the contact in your CRM
- Branded links and QR codes mean tracking that doesn't look suspicious to email providers
- Workflows with 20+ triggers let you tag, move, and re-sequence contacts based on real engagement