About
Built by a technology visionary and systems architect
Mailbox MCP is built by Mark McNeece, founder of 365i: a hosting expert, technology visionary and systems architect who has been running production mail and web infrastructure since 2002.
- Company BSolve IT Limited
- Registered England and Wales, 04607330
- Trading since 2002
Origin
Why this exists
Claude turned out to be genuinely useful for the parts of a working day that are made of email: finding the thread where a decision was actually made, drafting the reply that has been sitting undone for a week, filing the things that pile up. The obstacle was never whether it could help. It was that getting it near a real mailbox meant either copying messages about by hand or trusting a tool that would leave a mess behind.
Leaving a mess is the part that matters. A mail integration that marks everything read, or files a duplicate of every sent message, or starts a fresh conversation instead of replying inside the existing one, has not saved you an hour. It has cost you an afternoon and made your mailbox less trustworthy than it was before.
So the product was built around a single test: after Claude has used your mailbox, can you tell? Threading, sent copies, read flags and attachment bytes all had to come out the way a person using a normal mail client would have left them. Those are the measurements on the home page, and they are on the home page because they are the whole argument.
The Microsoft 365 side came from the same place. Microsoft ended password access to those mailboxes in 2022, which quietly put them out of reach of most tools in this category. Supporting them properly is more work and it is the reason a lot of businesses cannot use the alternatives.
The author
Who builds it
Mark McNeece, founder of BSolve IT Limited, which has spent its whole registered life building and running things for other people's businesses. That is a useful background for this, because most of what goes wrong with a mail integration goes wrong in the same places it goes wrong for a hosting customer or a website client.
365i is the hosting arm of that company: managed WordPress hosting, Linux web hosting, plans built for agencies, managed cloud servers, VPS hosting, and domain registration. That background matters here more than it looks like it should. A mail connection fails at the DNS record, the certificate, the authentication method, or a limit the provider never wrote down, and that is the same list that fills a hosting support queue.
There is no support department and the site does not pretend there is. Email support@mailbox-mcp.com and you are writing to the person who built the thing you are asking about. That is worth more than a queue, and it is also the honest reason there is no telephone number: a phone line nobody answers reliably is worse than an inbox somebody reads.
The open standard this site is built to
He also publishes AI Visibility, an open community specification for AI
Discovery Files: the machine-readable files a site serves at fixed
root-level paths so an AI system can establish what the site is, what it
offers, and what it permits. It is versioned, published under CC BY 4.0
with JSON Schemas, RFC-style wording and a validator, and it covers ten
files rather than the single llms.txt most sites stop at.
This site implements the full set, which is the reason /llms.txt and the files beside it are generated from one source here instead of being written out by hand and left to drift apart. Publishing the specification and then failing to follow it would be the easiest thing in the world to do quietly, so it is worth saying which of the two this site is.
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AI Visibility
The project behind the AI Discovery Files specification, and the standards work that sits underneath the files this site serves.
Visit AI Visibility -
The specifications
All ten, with RFC-style requirement wording, JSON Schemas, a command-line validator and test vectors, published under CC BY 4.0.
Read the specifications -
AI Visibility Checker
A free scan of any site: which of the files it publishes, whether crawlers can reach them, and whether the identity they declare agrees with itself. Scored out of 100.
Check a site -
AI Discovery Files for WordPress
Completely free, always. Generates the whole set on a WordPress site, across three levels of completeness, so a site can publish them without hand-writing ten files.
Get the plugin
Practice
How we work
Five habits, which you can check against the rest of the site.
Numbers rather than adjectives
Where this site states a figure, it was measured rather than estimated, and the page says what it was measured against. Nothing is rounded up into a better number. When there is no measurement, there is no claim.
One price, one limit
The price and the daily limit come from one place and appear identically everywhere, including in the control panel. Two numbers for the same thing on two pages is the sort of small dishonesty that predicts larger ones.
The limits are written down
Every page carries a section on what the thing does not do. It is a better guide to whether a product suits you than any feature list, and it is cheaper for both of us than a refund.
The guides say what is actually wrong
Both connection guides exist because the published advice is out of date. They tell you that Google removed the IMAP toggle, that a passkey does not unlock app passwords, and that the Microsoft permissions are not where every other guide says they are. That is the useful part.
Somebody else is welcome to check
We give developers and reviewers a complimentary year of Pro so they can test this properly and publish whatever they find. A positive review is not a condition, we do not ask to see the piece before it goes out, and we do not ask anybody to soften a criticism. The offer exists because the free allowance is 5 calls a day, which is not enough to review anything.
The entity
Company details
| Trading name | Mailbox MCP |
| Registered company | BSolve IT Limited |
| Company number | 04607330, England and Wales |
| Incorporated | 3 December 2002 |
| VAT number | GB 806 170 747 |
| Registered office | 5 Epping Close, Barton Seagrave, Kettering, Northamptonshire, NN15 6TR |
| support@mailbox-mcp.com |
The registered office is published because a trader selling online to consumers in the UK has to give a geographic address. It is not a place to visit and there is nobody there to see you; support is by email and gets answered faster.
Connect a mailbox.
5 calls a day, free, on any mailbox, with no card and no trial clock.