QuickMail has been around since 2014 and built its reputation on being the reliable, agency-friendly workhorse of cold outreach: email and LinkedIn automation in one tool, unlimited connected mailboxes and LinkedIn accounts on every tier, and Inbox Rotation™ to spread sending volume across accounts and protect sender reputation. It also layers in AI-powered email rewriting to help dodge spam filters and built-in LinkedIn lead sourcing. What it does not do is find verified leads for your specific campaign or write your emails for you — you bring the contact list (or source it manually on LinkedIn) and you build the sequences.
Defrost is built around the opposite assumption: you describe who you want to reach, and the pipeline finds those leads independently — live search, scraping, and public registries, never a static purchased list or data broker — verifies every address through a multi-provider verification cascade, writes personalized copy per recipient, and sends through a Defrost-managed relay with per-customer DKIM, automated warmup, and a 3% bounce-rate auto-pause. There is also a done-for-you tier where Defrost runs the entire campaign; QuickMail has no equivalent, and its top plan is priced and scoped for agencies who want to operate the tool themselves.
| Feature | Defrost | QuickMail |
|---|---|---|
| What it fundamentally is | A done-for-you cold outreach pipeline: find leads → verify → write → send. | Email + LinkedIn multichannel outreach automation software, built for agencies and SDRs who run their own campaigns. |
| Lead sourcing | Independent, live discovery per campaign via search, scraping, and public registries. No purchased lists, no data-broker credits. | You upload your own contact list, or use built-in LinkedIn lead sourcing to find and auto-connect with prospects manually based on your ICP filters. |
| Email verification | Every address checked through a multi-provider cascade before sending. | Email verification is offered as a feature, but list-building and quality control are still your responsibility going in. |
| Email writing | Per-recipient personalized copy generated as part of the pipeline for every lead. | You write the sequences; AI is used to rewrite/vary existing copy to help avoid spam filters, not to research and draft each email from scratch. |
| Channels | Email only, sent through a managed relay built for deliverability. | Email and LinkedIn together, with a unified inbox for replies across both channels — a real advantage if multichannel is a requirement. |
| Sending infrastructure | Defrost-managed relay with per-customer DKIM, automated warmup, and a 3% bounce-rate auto-pause. | Unlimited connected mailboxes and LinkedIn accounts on every plan, with Inbox Rotation™ and AutoWarmer to distribute volume and protect sender reputation across your own connected accounts. |
| Pricing model | Flat monthly plans from $79/mo (500 leads, 2 mailboxes) to $1,200/mo (10,000 leads, 40 mailboxes); annual pricing as low as $63/mo equivalent on Starter. | Starter $49/mo (5,000 emails/mo, 1,000 uploaded contacts, 1 workspace), Growth $99/mo (100,000 emails/mo, 25,000 contacts), Agency $299/mo (500,000 emails/mo, 100,000 contacts, 2 workspaces; extra workspaces $49 each). |
| Trial | No free trial — card charged at checkout, plan active immediately, backed by a 30-day money-back guarantee. | 14-day free trial on every plan, no automatic billing after the trial ends. |
| Done-for-you option | Yes — a DFY tier where Defrost runs the whole campaign for you. | No packaged done-for-you tier; the product is built for teams and agencies operating campaigns themselves. |
| Team / workspace structure | Plans scale by leads and mailboxes; the Agency tier is built for unlimited workspaces and seats to run multiple client accounts. | Unlimited team members on every plan, but workspaces are capped (1 on Starter/Growth, 2 on Agency) with a $49/mo charge per additional workspace — a real cost at scale for agencies running many clients. |
| Who runs it day to day | Anyone — describe your ideal customer once, Defrost handles sourcing, verification, copy, and sending. | Best for agencies and SDRs who want hands-on control of multichannel sequences, their own lead lists, and LinkedIn outreach alongside email. |
Who should choose Defrost
Choose Defrost if you want the whole outbound motion handled — fresh, independently-sourced leads that match who you are actually trying to reach right now, verified addresses, written copy, and protected sending — without assembling a contact list, writing sequences, or babysitting deliverability yourself. It fits founders, SMBs, and agencies that would rather hand off the pipeline than operate it, especially with the done-for-you tier available. Stale or purchased contact data is a real cost even with good sending tooling wrapped around it; see why bought lead lists bounce and the broader cold email deliverability guide.
Who should choose QuickMail
Choose QuickMail if you specifically need LinkedIn and email working together in one tool, you already have a process for sourcing or uploading your own lead lists, and you want a team of people writing and running sequences with unlimited connected mailboxes and LinkedIn accounts. It is a mature, agency-oriented platform with a genuinely useful multichannel unified inbox and Inbox Rotation™ for deliverability — the tradeoff is that lead sourcing quality, list hygiene, and copywriting stay your team's job rather than being handled for you.
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Frequently asked questions
- Does Defrost include LinkedIn outreach like QuickMail does?
- No — Defrost is email only, sent through a managed relay built for deliverability. QuickMail combines email and LinkedIn automation with a unified inbox, which is a real advantage if multichannel is a requirement. Defrost trades that breadth for owning lead sourcing, verification, and copy on the email channel alone.
- Do I still need to source my own leads if I switch to Defrost?
- No. QuickMail requires you to upload your own contact list or source prospects manually through its built-in LinkedIn tools. Defrost replaces that step: every campaign runs an independent, live discovery pass via search, scraping, and public registries, with every address verified through a multi-provider cascade before sending.
- Can I bring over my QuickMail sequences and connected mailboxes?
- Not directly — Defrost builds each campaign fresh from your ideal customer profile rather than importing sequences, and sends through its own managed relay rather than your connected inboxes. If you have prior replies or opt-outs, import that history as a suppression CSV before your first send.
- Is there a done-for-you tier, since QuickMail is agency-operated?
- Yes — Defrost offers a DFY tier where Defrost runs the entire campaign for you. QuickMail has no packaged equivalent; it is built and priced for agencies and SDRs who operate the tool, their lead lists, and their multichannel sequences themselves.