Should I buy inboxes through Instantly or through PuzzleInbox?
scalefast · 2026-02-18 · 2,890 views
I use Instantly as my sending platform and love it. But should I buy inboxes directly through Instantly or get them from PuzzleInbox and connect them?
Instantly inboxes: Convenient since everything is in one platform. But you do not get the same level of control over your infrastructure. If Instantly has a platform issue, your sending and your inboxes are both affected. Also, their inbox quality varies depending on the provider they source from.
PuzzleInbox inboxes connected to Instantly: You own the Google Workspace accounts. Full control over DNS, warmup, and account settings. If you ever switch sending platforms, your inboxes come with you. PuzzleInbox handles all DNS configuration and pre-warming. You just connect via OAuth or SMTP/IMAP to Instantly.
My recommendation: separate your infrastructure from your sending platform. Buy inboxes from a dedicated provider like PuzzleInbox and connect them to whatever sending tool you prefer. This gives you flexibility and better deliverability control.
Comments (9)
agencygrind · ScaleOutbound · 2026-02-04
The jump from 10 to 100 inboxes is where most people break. What changes: you NEED a spreadsheet or tool tracking every domain, inbox, warmup status, and DNS config. At 10 you can keep it in your head. At 100 you absolutely cannot.
tina_infra · 2026-02-04
DNS management becomes a real job at 100 inboxes. you're looking at ~34 domains (at 3 inboxes per domain). that's 34 sets of SPF, DKIM, and DMARC records to configure and maintain. one wrong record and a whole batch of inboxes tanks
laurenops · 2026-02-05
the biggest operational change for us was batch management. we set up new inboxes in batches of 10-15, warm them for 14 days, then deploy. trying to add inboxes one at a time at this scale is madness
haileyops · 2026-02-05
pre-warmed inboxes are a game changer at this scale. when we were warming 100 inboxes manually it was a full-time job. now we skip that entire 2-3 week warmup phase per batch by buying pre-warmed
scalingsammy · 2026-02-06
how do you handle the 60/40 Google Workspace to Outlook split at 100 inbox scale? that's like 60 GWS and 40 Outlook — are you buying them all from the same provider?
coldkingdom · 2026-02-06
we do exactly that split. 60 GWS at $3-4.50 each 40 Outlook at $0.35 each. total infrastructure cost is way less than what we used to pay. the platform diversification helps with deliverability too not all your eggs in one basket
multisendermike · 2026-02-07
monitoring becomes critical at scale. you need to track reply rates, bounce rates, and spam complaints per inbox — not just per campaign. one bad inbox can drag down your whole sending reputation if you don't catch it
joshagency · ColdAgency · 2026-02-07
Rotation strategy matters too. At 100 inboxes you should be retiring and replacing domains every 3-6 months. We keep a pipeline of new domains warming up so we always have fresh ones ready. The operational overhead is real but manageable with good systems.
grindgary · 2026-02-08
the financial tracking gets complex too. 100 inboxes across multiple providers, domains from different registrars, sending platform costs... built a custom spreadsheet just to track costs per client per inbox. absolute pain but necessary