Reviewed by Alexis Morain · Updated September 26, 2026
A convenient service for quickly setting up a cold email infrastructure without touching it yourself, weighed down by vendor opacity that calls for caution around compliance and sending reputation.

Premium Inboxes is a service that sets up dedicated mailboxes for cold email. Instead of configuring your own domains and sending addresses, you order Google or Microsoft mailboxes already set up, with technical authentication configured by hand.
You choose a mailbox volume and a provider (Google Workspace or Microsoft 365), and the service configures SPF, DKIM, and DMARC records, then delivers addresses ready to plug into a sending tool like Instantly or Smartlead. The goal: quickly get a sending infrastructure for cold outreach, without risking your main domain's reputation. The target audience: agencies and sales teams doing cold email at scale.
The vendor isn't very transparent: the company, headquarters, and founding year aren't clearly public. Cold email remains a practice that needs legal oversight (GDPR in Europe), and outsourcing your sending infrastructure to an opaque third party calls for caution around compliance and reputation.
Pricing runs per mailbox: around $3.50 per mailbox per month on the Standard plan, $4.50 on the Insured plan (enhanced monitoring and support). Annual billing gives about a 20% discount. Setup is advertised within 24 hours, often same-day.
Preconfigured mailboxes
Google Workspace or Microsoft 365
Authentication
SPF, DKIM, and DMARC set up by hand
Fast setup
Delivery within 24 hours
Tool integration
Compatible with Instantly, Smartlead, and similar tools
Premium Inboxes charges per mailbox: around $3.50 per mailbox per month on the Standard plan, $4.50 on the Insured plan (enhanced monitoring and support). You choose the volume and the provider (Google Workspace or Microsoft 365). Annual billing gives about a 20% discount on both plans. Setup, with SPF, DKIM, and DMARC configured by hand, is advertised within 24 hours.
Standard
Google or Microsoft · SPF, DKIM, DMARC configured · Setup within 24h
$3.50 per mailbox/month
Insured
Enhanced monitoring · Priority support · Replacement
$4.50 per mailbox/month
Annual
Annual billing · Volume of your choice · 20% savings
-20% on both plans
Pricing verified on July 12, 2026
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