Line by line
| Feature | Inboxkit | Mailreef |
|---|---|---|
| Mailboxes | Official, paid Google Workspace and Microsoft 365, plus Azure | SMTP and IMAP mailboxes on a dedicated Mailreef server and IP |
| Claude Code / Codex (MCP) | Remote MCP server, connects to Claude Code and Codex | No MCP listed |
| Price | $3 a mailbox, or $2.50 on annual billing | Agency $240 a month on 12 months; Agency Flex $249 month to month |
| Send fees | Price is per mailbox | $0.001 a send, or $1 per 1,000 |
| Capacity | Add mailboxes one at a time; Azure holds up to 100 a tenant | Unlimited mailboxes a server; about 150 recommended |
| After a downgrade | No plans, no minimums | 120 days before servers or IPs can go back up, unless Mailreef grants an exception |
| Bought per mailbox | $3 each, direct | $3.99 each inside Smartlead, plus $19 a domain a year |
| API | Full REST API with webhooks on every account, 119 endpoints | Developer API on all plans, plus Zapier |
| Monitoring (add-on) | InfraGuard: blacklists, DNS, bounces and placement every six hours, with auto-pause | Server and mailbox monitoring included; no frequency stated |
Competitor details from public pages, checked 19 Oct 2026. Sources: Mailreef pricing (mailreef.com); Mailreef homepage (mailreef.com); Mailreef terms of service (mailreef.com); Mailreef Google Workspace alternative (mailreef.com); Smartlead pricing (Mailreef mailboxes) (smartlead.ai); Inboxkit pricing.
Competitor offers can change after that date. Trademarks belong to their owners.
Prices at common volumes
| Mailboxes | Inboxkit, monthly | Inboxkit, annual | Mailreef |
|---|---|---|---|
| 150mailboxesMailreef: 1 Flex server, before send fees | Inboxkit, monthly$450 | Inboxkit, annual$375 | Mailreef$249 |
| 500mailboxesMailreef: 4 Flex servers, before send fees | Inboxkit, monthly$1,500 | Inboxkit, annual$1,250 | Mailreef$996 |
| 1,000mailboxesMailreef: 7 Flex servers, before send fees | Inboxkit, monthly$3,000 | Inboxkit, annual$2,500 | Mailreef$1,743 |
Mailreef is cheaper at these volumes before send fees. Its mailboxes are SMTP on its own servers.
Mailreef totals use Agency Flex, $249 a server month to month, at 150 mailboxes a server. Agency is $240 on a 12-month commitment. Sends add $1 per 1,000.
Mailreef pricing against Inboxkit
Mailreef prices by server. Agency is $240 a month on a 12-month commitment, and Agency Flex is $249 month to month. Both add $0.001 a send, which is $1 per 1,000. Enterprise pricing is custom.
A server holds unlimited mailboxes, and Mailreef recommends about 150. At that size, 1,000 mailboxes need 7 Flex servers: $1,743 a month before send fees. Inboxkit is $3,000, or $2,500 on annual billing.
Smartlead also sells Mailreef mailboxes one by one, at $3.99 a mailbox plus $19 a domain a year. Inboxkit sells single mailboxes direct at $3.
What a Mailreef mailbox is
Mailreef mailboxes run on a Mailreef mail server and IP, with SMTP and IMAP credentials. They are not Google or Microsoft accounts.
Inboxkit sells official, paid Google Workspace and Microsoft 365 mailboxes at the same $3. For Microsoft volume, one Azure tenant holds up to 100 mailboxes for $30 a month.
Mailreef setup and scaling
Mailreef’s homepage says you create domains and mailboxes in 1 click.
After you downgrade servers or IPs, Mailreef’s terms apply a 120-day cooling-off period. During it you cannot go back above the lower level, unless Mailreef grants a written exception.
Inboxkit has no plans and no minimums, and you pay only for the mailboxes you add. Orders complete in 30 to 120 minutes, automatically, with SPF, DKIM and DMARC configured.
Mailreef monitoring and warmup
Every Mailreef plan includes server and mailbox monitoring. Its pages state no check frequency.
Inboxkit’s warmup runs for 14 days on an isolated network, at $3 a mailbox. InfraGuard checks blacklists, DNS, bounces and inbox placement every six hours, with alerts and auto-pause. Both are add-ons, and InfraGuard’s first month is free.
Mailreef API, MCP and automation
Every Mailreef plan includes developer API access, and Mailreef has a Zapier integration. Its homepage and pricing page list no MCP server.
Every Inboxkit account gets the full REST API, with 119 endpoints and webhooks. Connect Claude Code or Codex to Inboxkit’s remote MCP server to run your mailbox work from an agent.
Mailreef reviews and support
Inboxkit is rated 4.7 out of 5 on G2 from 120 reviews.
Inboxkit support runs 24/7 on Slack, in-app chat and email. Mailboxes export in one click to 24+ sequencers, including Smartlead and Instantly.
Switch from Mailreef in four steps
Create a free account
Pay only for the mailboxes you add. No plan to pick first.
Buy or connect domains
Then add Google Workspace, Microsoft 365 or Azure mailboxes on them.
Export to your sequencer
One click to 24+ sequencers, including Smartlead and Instantly.
Run both side by side
Warm up here while Mailreef keeps sending. Move campaigns before your plan renews.
Questions about Mailreef
Is Mailreef cheaper than Inboxkit?
At volume, before send fees, yes. 1,000 mailboxes on 7 Flex servers cost $1,743 a month, against $3,000 on Inboxkit. Every 1,000 sends adds $1 at Mailreef.
How does Mailreef pricing work?
You pay per server: $240 a month on a 12-month commitment, or $249 month to month. Each send adds $0.001. Mailreef recommends about 150 mailboxes a server.
What happens if I downgrade at Mailreef?
Its terms set a 120-day cooling-off period. You cannot raise servers or IPs above the new level, unless Mailreef grants a written exception.
Are Mailreef mailboxes Google Workspace or Microsoft 365?
No. They are SMTP and IMAP mailboxes on a Mailreef server. Inboxkit sells official, paid Google Workspace and Microsoft 365 mailboxes. Azure is $30 a tenant for up to 100.
Does Mailreef have an MCP server?
Its homepage and pricing page list a developer API and no MCP server. Inboxkit includes the REST API and a remote MCP server on every account.
Is Mailreef legit?
Mailreef is a working SMTP provider with published prices and terms, and Smartlead sells its mailboxes too.
How do I move from Mailreef to Inboxkit?
Open a free account, buy or connect domains, and add mailboxes. Export them in one click to your sequencer. Keep Mailreef sending until your campaigns have moved.
Open a free account
$3 a mailbox, no minimum. Google Workspace, Microsoft 365 and Azure.
