Best Inbox Providers for Cold Email in 2026: Our Top 3 Picks
⚡ Quick answer ✓sending.ac: flat Microsoft Azure plans. Growth is $199/month with 350 inboxes included. Best when you need a lot of inboxes. ✓InboxKit: Google and Microsoft at $3.00 per mailbox ($2.50 annually), no minimum. The cheapest of our picks for 30 inboxes at $98.72/month with domains. ✓Cheap Inboxes: same price for Google and Microsoft, […]