Inboxkit offers no free tier or free trial based on G2 pricing data. The entry point is $2.50/month per mailbox, available for both Google Workspace and Microsoft 365 accounts. Inboxkit's higher tier, Azure Enterprise mailboxes, is priced at $30/month per domain and supports 25, 50, or 100 mailboxes at a flat rate, making per-mailbox cost drop significantly at volume. Key differentiators across Inboxkit's pricing tiers include infrastructure type, IP reputation, and deliverability optimization, with Azure offering dedicated Microsoft Azure IPs and higher sender reputation. Custom enterprise quotes are available for larger needs beyond the three standard tiers.