Composio gives agents hosted MCP access to Gmail and a large catalog of other applications, with managed authentication and dozens of Gmail actions. Fluxmail focuses on email, with normalized email tools across Gmail, Outlook, Exchange, and IMAP over MCP and REST. Fluxmail Cloud hosts it for you. Self-hosted Fluxmail keeps tokens on your own machine, includes a Google client for local Gmail setup, and has a CLI.
This comparison covers Fluxmail Cloud, which we host, and self-hosted Fluxmail, which you run. Cloud doesn’t keep a copy of your mail.
Updated
Choose Fluxmail when email depth, self-hosting, provider portability, and mailbox-specific access controls matter more than a broad app catalog. Choose Composio when Gmail is one integration in a much larger agent stack and you want hosted access to that broader catalog.
| Feature | Fluxmail | Composio Gmail |
|---|---|---|
| Platform | ||
| Product focus | Email infrastructure | Multi-app agent integrations |
| Standard deployment | Fluxmail Cloud or self-hosted | Composio-hosted sessions and MCP URLs Enterprise options advertise VPC or on-premises deployment |
| Interfaces | MCP, REST API, and CLI The CLI is self-hosted only | MCP sessions, SDK, and API |
| App catalog | Email only | Large catalog across business apps |
| Email-provider model | One model across Gmail, Outlook, Exchange, and IMAP | Separate Gmail, Outlook, and mail toolkits |
| Tools and authentication | ||
| Current Gmail actions | Normalized email tools | Gmail-specific actions |
| Gmail triggers | No public trigger catalog | Gmail event triggers |
| OAuth setup | Sign in with Google or Microsoft in Cloud Self-hosted: bundled Google client for local setups, or your own OAuth app | Managed OAuth or your own credentials |
| Token custody | Encrypted in Fluxmail Cloud or on your own host | Stored and refreshed by Composio with managed auth |
| Tool discovery | Fixed email tool set filtered by permission | Session meta tools search and load tools at runtime |
| Control and cost | ||
| Action restrictions | Named profiles or custom capability policies | Allowed tools and OAuth scopes |
| Mailbox scope | Per member and per connection | Per user session and connected account |
| Pricing | Free self-hosted plan; Pro $15/month; Business $25/member/month Same Pro and Business prices in Cloud and self-hosted. Annual: Pro $120; Business $240/member | Hobby free; Pro $29/month plus usage; Enterprise custom 100K free tool calls/month; managed apps have a lower allowance; Pro includes $29 usage credit |
Composio provides separate toolkits for Gmail, Outlook, and generic mail alongside its broader app catalog. Agents may need different tools and schemas as they move between email providers.
Fluxmail provides one set of normalized email tools across Gmail, Outlook, Exchange, and IMAP. The same email model is available through MCP and REST, plus a CLI when self-hosted, so an agent or backend can switch providers without rebuilding the workflow.
Composio stores and refreshes tokens when you use managed authentication, including with your own OAuth app. It also supports self-managed credentials passed at execution time without storing or refreshing them.
Self-hosted Fluxmail connects Gmail with its bundled Google client for local setups, or with your own Google credentials. Provider tokens remain encrypted on the machine where you run it, and email never passes through a service Fluxmail runs. Fluxmail Cloud encrypts provider tokens in its own database and does not store messages or attachments. In both, you choose which mailboxes each client can use.
Fluxmail plans are based on members and connected mailboxes. Self-hosted calls run on your own instance, and the operator pays for the machine and any provider usage. Fluxmail Cloud has no monthly usage allowances or overage charges, though API calls and sends have hourly limits.
Composio Hobby includes 100,000 tool calls and 50,000 triggers per month with three team members. Pro costs $29/month with $29 in usage credit, then bills for usage. Composio-managed apps have lower allowances: up to 20,000 tool calls and 10,000 triggers within those free totals. Check which authentication path your Gmail connection uses when estimating cost.
We reviewed the linked product docs on October 8, 2026.
Run Fluxmail on your own infrastructure and use it through MCP, REST API, or CLI.