Deliverability & Spam Testing

Bouncer verifies email lists in bulk, checks addresses in real time via API, and monitors inbox placement, with pay-as-you-go pricing from $0.002 per check.

Slicey is a managed cold email infrastructure service: pre-warmed Google and Microsoft inboxes set up for you, with deliverability monitoring and swaps.

Mailook is a free email deliverability checker that scans blacklists and inspects SPF, DKIM, and DMARC records, then explains fixes in plain English.

Mailivery warms up email accounts with AI-powered real interactions plus spam and blacklist monitoring to improve deliverability, from $29 per month.

Fyxer AI triages your inbox, drafts replies in your voice, and takes meeting notes in Gmail or Outlook, with plans starting at $22.50 per user monthly.

Scrubby is a specialist email verifier for catch-all and risky addresses, using deep verification to resolve contacts standard tools return as unknown.

Mailtrap review: verified 2026 pricing across its sending API, testing sandbox, and marketing tools, plus G2, Capterra, and Trustpilot sentiment.

MailToaster is a peer-to-peer email warmup service that builds sender reputation for Gmail and Outlook, priced at $29 per mailbox per month.

GlockApps tests inbox placement across major ISPs and monitors DMARC records and blacklist status, flagging deliverability problems before they escalate.

Breakcold is an AI-native CRM that unifies LinkedIn, email, and WhatsApp threads, enriches contacts, and lets AI agents update pipelines and drafts.

HotHawk is a cold email sequencing platform with evergreen campaigns, a shared reply inbox, automatic routing, and a Google/Microsoft mailbox warmup network.

GMass is a Chrome extension that turns a Gmail account into a mail-merge and cold email platform, adding sequences, tracking, and verification.

Zapmail sells pre-warmed Google and Microsoft mailboxes for fast campaign starts. This review covers real per-mailbox costs, refunds, and IP-origin complaints.

Clean Email sorts mail into smart folders, mass-unsubscribes from unwanted lists, and runs cleanup rules automatically across Gmail, Outlook, and more.

Hexospark combines cold email outreach with a built-in CRM and LinkedIn lead capture, but the Solo plan caps at one inbox and independent reviews are scarce.

Amplemarket bundles B2B contact data, buying signals, multichannel sequencing, and mailbox deliverability into one AI sales platform from $600/month.

Warmbox is a standalone email warmup service that runs automated inbox interactions across a private network to lift sender reputation before campaigns.

Mailscale mass-provisions low-cost cold email inboxes with automated DNS setup. This review breaks down real per-mailbox costs and deliverability complaints.

Lightmeter is a managed email delivery service with its own mailservers, daily inbox placement testing, and no published self-serve pricing.

Verifalia is a long-running email verification service offering batch list cleaning, a real-time API, and credit packs alongside daily-allowance plans.

MailMonitor is an enterprise deliverability service pairing 400+ inbox analytics with expert-led audits, remediation, and monitoring from $1,000/month.