Instantly is a phenomenal sending platform. Its DFY domains and pre-warmed inboxes are another story: ~$10/mailbox, locked to Instantly, with Instantly retaining domain ownership. Compare that with infrastructure you actually own.
Read the fine print on DFY. Per Instantly's own help center: domains purchased through the DFY service remain owned and administered by Instantly and cannot be transferred, and DFY accounts are configured exclusively for use within Instantly. Community reviews have additionally reported waves of bans on reseller-panel-hosted DFY accounts. Whatever provider you choose — own your domains.
| Feature | CLAYINBOX | Instantly |
|---|---|---|
| Mailbox price | $2.50/mo (pre-warmed $4.50) | ~$10/mailbox/mo (pre-warmed tier) |
| Domain ownership | YOU own every domain | Instantly retains ownership + admin; non-transferable |
| Portability | Any sequencer, anytime | Locked to Instantly only |
| Providers | GW, M365, Azure, SMTP | Google Workspace focus |
| Admin access | ✓ full | Instantly holds admin on DFY |
| Warmup | Included, isolated network | Instantly warmup network (large shared pool) |
| Monitoring / placement | ✓ included free | Platform-level deliverability tools |
| Free replacements | ✓ unlimited | Per DFY policy |
| Unified inbox | ✓ infra-level | Instantly Unibox (sequencer-level) |
| Sequencer cost on top | Instantly from ~$37–47/mo | Same |
| Exit risk | None — take everything with you | Domains + accounts stay behind |
*you pay for domains you can never take with you
Instantly the sequencer is best-in-class for solo founders and small teams — clean UI, unlimited connected accounts, a 450M+ lead database, AI reply handling, and a 4.8/5 on G2 across thousands of reviews. Connecting external accounts (like CLAYINBOX') via OAuth or app passwords is exactly what it's built for.
Roughly 4× cheaper than DFY pre-warmed, with full legal ownership of domains, full admin on accounts, portability to any tool, isolated warmup instead of a giant shared pool, monitoring included, and provider options (M365, Azure, SMTP) the DFY program doesn't touch. The DFY lock-in isn't a pricing detail — it's a structural risk to your entire outbound channel.
Provision and warm on CLAYINBOX, one-click export into Instantly, send through Instantly's engine, reply from Unibox. If you ever outgrow Instantly, your infrastructure walks out the door with you — that's the whole point.
Flat $2.50/mailbox. Warmup, monitoring, replacements, unified inbox — all included.