Email on your own domain.
A full email client. Threads, snooze, scheduled send, rules and shared mailboxes, with every message opening beside the person who sent it.
Everything in the inbox
Mailboxes, compose, templates, filters, deliverability and tracking, on our own mail cluster rather than a reseller's.
The Inbox
Threads, snooze, search and shortcuts.
Compose
Write it, sign it, and decide when it leaves.
Who Sent It
Their orders, their bookings, their history.
One Timeline
Email, calls and meetings on the one contact.
Your Mailboxes
Three ways to get one, on a cluster we run.
Shared Inboxes
A mailbox a team works, and who pays for it.
Migration
Bring the mail you already have across.
Attachments
Browsable outside the thread they arrived in.
Every Email From You
The envelope every app sends under.
Signatures
Sign off the same way every time.
Send As & Templates
Write it once and send it as often as you need.
Filters
Your rules, applied before you open the inbox.
Deliverability
What keeps a message landing where it was addressed.
Tracking
What happened to the message after it left.
Several Businesses
One account, and the addresses each one sends as.
Governance
The part you only notice when it is missing.
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Kinds of mailbox in one inbox
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Seconds to take a send back
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Authentication protocols published for you
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Access roles on a shared inbox
The email client you already know how to use.
Everything you expect from email, in a client that is part of your business rather than bolted onto it.
Thread View
Conversations grouped by thread. Expand, collapse, reply inline.
Compose
Rich text, attachments, inline images, CC and BCC, signature on demand.
Snoozed
Send a message away until tomorrow morning, next Monday, or a time you pick.
Search
Full text across every mailbox, filtered by sender, date or attachment.
Keyboard Shortcuts
Navigate, archive, reply and compose without reaching for the mouse.
On Your Phone
Add it to your home screen and read the same inbox, threads and rules.
Write it, sign it, and decide when it leaves.
Rich text with attachments and inline images, CC and BCC, and your signature inserted on demand. Pick the address it goes out as, or set a time and let it send itself. Drafts save as you type.
Every message you open is already about somebody your business knows.
Open an email. See who sent it. Their orders. Their history. Their last booking.
The sender's record opens beside the message. Bookings and orders are scoped to that contact, so you see their history and nobody else's.
Every channel, one timeline.
Somebody who emails on Monday and calls on Thursday is one person, not two inboxes.
Every message saves to Link
Beside every other conversation your business has had with that person.
The call, the meeting, the text, the social message
All of them, on the one contact.
Open a contact and it is all there
In one timeline, in the order it happened.
Your domain, your mailboxes, and we run the mail server.
Three ways to get one: an address on calistomail.com you can read today, mailboxes on a domain you own with guided DNS, or an account you already run, connected while you move.
Calisto-Hosted
We run the mail server on our own cluster. Point your domain at it with guided DNS, then add mailboxes as you need them, billed per mailbox on the domain.
Connect Existing Accounts
Gmail, Outlook or any IMAP host arrives in the same inbox, with the credentials encrypted at rest. Inbound only: you always send from your Calisto address.
Personal and Role Mailboxes
Named mailboxes (alex@yourbusiness.com) and role mailboxes (support@, billing@, info@) work the same way, so a shared address is a real mailbox rather than a forwarding rule.
Because We Run It
A blocked sender is rejected at delivery rather than filtered after it arrives, and sign-in email is routed off the mail path, so a mail problem is never a login problem.
Bring what you have.
Connect the Gmail, Outlook or IMAP account you run now and your mail starts arriving in the Calisto inbox. Your contacts come with it. Set up your domain, move your mailboxes, and the connected account has done its job. Inbound only. One way.
Attachments live in Depot.
The attachment was never really in the thread.
It arrives as a file in Depot
Counted against your storage, browsable from outside the mailbox.
The same store as a file you made in Docs
There is one place files live.
Findable without remembering who sent it
The contract somebody emailed last quarter is not lost behind a name.
Every email your business sends, from your own domain.
Proposals, signature requests, campaigns, form confirmations and deal follow-ups all leave under your name, on one mail infrastructure.
Proposals
A proposal leaves as proposals@yourbusiness.com, with open tracking and view analytics behind it.
Sign
A signature request comes from your domain, so the recipient sees your name on it.
Campaigns
Newsletters and marketing email sent from your domain with DKIM authentication, on your domain’s reputation.
Forms
Form confirmations and notifications, from your domain.
Deals
Follow-ups, quotes and stage notifications, from your domain.
Set the rules once and stop sorting.
Rules that file, label or forward on arrival, sender lists enforced at the server itself, and an out-of-office that switches itself off.
Sign off the same way every time.
Maria Chen
Operations Manager, Resort Alma
+1 (555) 234-5678
resort-alma.com
Away, and it answers for you.
Set a start, an end, a subject and a message, scoped to everyone, to contacts only, or to your own team. It answers each sender once rather than on every message they send, and it switches itself off when the window closes.
Every address you own, from one mailbox.
One mailbox can write as bookings@, events@ or your own name, each with its own signature line and one of them the default.
Write it once. Send it every week.
Save a subject and body as a template, then start a new message from it in one click.
Filters, blocked senders and safe senders.
A rule matches on sender, subject or recipient, then files, labels or forwards the message before you ever open the inbox.
Match on From, Subject or To, then move to a folder, apply a label, archive, delete or forward.
Built once, run on every message as it arrives.
An address you block is rejected at the mail server, before it reaches the inbox.
Unblock it again from the same list.
An address on the safe list is never filtered or marked as spam.
It is kept ahead of every block and spam rule.
DKIM, SPF and DMARC, configured during domain setup.
Calisto generates the exact records. Paste them at your registrar and hit verify.
Opens and clicks, per message and in total.
How many were opened at all, how many were clicked, and how many times the average one was opened. Sortable by opens.
Whose mailbox is it, and who pays?
Several businesses under one account, and the same governance over every one of them.
Three businesses, one inbox.
Every mailbox you can reach, queried in parallel.
One offline does not stop the rest
If one goes down, the other two still load.
Grouped by the business that owns it
The grouping is ownership, not folders.
The picker is a filter
Not a context switch.
Governed like everything else you send.
Mail settings live in Purview with an account default and a per-mailbox override. Data Rules apply to what a message read returns. Every outbound send gets a brand pre-flight, and Ethos decides whether that blocks or warns. Set it once in Blueprint and every business unit under it inherits.
Where Mail touches everything else.
4 of these 6 connections are in your plan today. The rest stay visible so you know the instrument is there before you need it.
Link
Every message saves to the contact timeline beside the call, the meeting and the chat.
Inbox
A conversation that is not email is the same conversation, in the same place.
Voice
Somebody who emails on Monday and calls on Thursday is one person, not two histories.
Depot
An attachment is filed in the shared file layer rather than living inside a mailbox.
Deals
A message is readable from the record it concerns without being forwarded into it.
Campaigns
A bulk send goes through Campaigns on your own domain, so reputation is not spent from a personal mailbox.
No setup cost. Pay when you start using.
Business email on your own domain.
Recommended for you
Works well together.
Calisto Link
Calisto Inbox
Calisto Voice
Calisto Depot
Calisto Deals
Calisto Campaigns
Everything included in Calisto Mail.
- Inbox, starred, snoozed, scheduled, sent, drafts, archive, spam, trash. Thread view. Rich text compose. Full-text search. Keyboard shortcuts.
- An included calistomail.com address, mailboxes on a domain you own with guided DNS, or an account you already run connected over OAuth or IMAP. Domain mailboxes are billed per mailbox; the included address and connected accounts are not.
- Contact record, active bookings, recent orders, Registry membership, Access events, and conversation history, visible alongside every email thread.
- One inbox across every mailbox you can reach, owned accounts and shared-inbox grants, grouped by Purview. Filter to one account or merge them all.
- Proposals, Sign, Campaigns, Forms, and Deals: every email Calisto sends on your behalf comes from your domain. Your clients always receive email from you.
- One rich text signature per mailbox with images and links, inserted on demand. Scheduled out-of-office auto-reply with a start and end window and per-scope recipients.
- The signature carries formatting, images and links, and is inserted on demand while composing.
- Out-of-office takes a start and end window, a subject and a message, scoped to everyone, contacts only, or internal senders. Repeat-sender dedup fires it once per sender rather than on every message.
- Rules that match on From, Subject, or To and act automatically: move, label, archive, delete, or forward. Blocked and safe sender lists enforced at the mail server.
- Rules match on From, Subject, or To with contains, equals, or starts-with, then move to a folder, apply a label, archive, delete, or forward. Built once, run on every incoming message.
- A forwarding address can be added to any rule, saved on the rule alongside its other actions.
- Blocked mail is rejected at the mail server, with a Trash quarantine fallback, so it never reaches the inbox.
- Server-level spam filtering catches unwanted mail before it reaches your inbox.
- Schedule any message for a future date and time. Pending sends collect in a Scheduled folder; cancel one before it fires.
- Save reusable email templates with subject and body. Start a new message from a template in one click.
- Author a template once, then start a message from it in one click, subject and body together.
- Grant teammates read, send-as, or manage access to a shared mailbox. Invite by email, change a role, or revoke access anytime.
- DKIM, SPF, and DMARC authentication. Guided DNS wizard. Verification.
- DKIM: cryptographic signing on every outgoing email, published as a TXT record. Receiving servers verify the signature to confirm the email was not altered and came from your domain.
- SPF: a TXT record authorizing your mail servers to send on behalf of your domain, which is what stops somebody spoofing it.
- DMARC: a TXT record telling receiving servers what to do with mail that fails DKIM or SPF, set to monitor, quarantine, or reject.
- Guided DNS setup: Calisto generates the exact TXT and CNAME records. Copy, paste into your registrar, hit verify. No manual key generation and no guessing at syntax.
- Mail is part of Calisto Interact, alongside Inbox, Voice, Live, Link, Orbit, Equipo, and Identity. Switch channels without losing context.
- Connect Gmail or Outlook over OAuth, or any host by IMAP, with the credentials encrypted at rest. Connected accounts RECEIVE into your inbox; sending always goes out from your Calisto address. Send-as identities save a name and signature preset per mailbox you own.
- Send-as identities let one mailbox write as bookings@, events@ or your own name, each with its own signature line and one of them the default.
- Draft a reply or summarize a long thread on request, right in the composer and reading pane.
- Open and click tracking on outbound email.
- Opens and clicks per message, with totals across everything sent: how many were opened at all, how many were clicked, and how many times the average one was opened. Sortable by opens.
Questions about Calisto Mail
Yes, on your own domain with your own envelope handling. It is business email rather than a forwarding layer over somebody else.
A message opens beside the sender bookings, orders and history, because the mailbox reads the same contact record the rest of the account does. You answer knowing what the person is to the business.
Yes, alongside personal ones, with threads, snooze, scheduled send and search. A shared mailbox is a real mailbox rather than a group alias somebody has to remember to check.
Connect your Gmail, Outlook, or IMAP account and your mail starts arriving in the Calisto inbox. Your contacts come with it. Set up your domain, move your mailboxes, and when you are ready the connected account has done its job. Inbound only, one-way.
Three kinds of mailbox, priced differently. A calistomail.com address costs nothing and there is no limit on how many an account holds. A mailbox on a domain you own is billed per mailbox to the account that owns it. An account you already run and connect costs nothing, because Calisto hosts nothing for it.
Bulk export in standard formats, or reach the data directly on your own database if you are on Bring Your Own Backend.
We run it. Our own cluster, our own SMTP, JMAP and ManageSieve.
The account that owns the mailbox, always.
Connected accounts bring their mail into your unified inbox. Sending always goes out from your Calisto address.
The rest of the inbox still loads.