EU operation · PGP and S/MIME · REST API · MCP-ready

Answered the same email twice? The solution: a team inbox.

Astreo brings info@, support@ & co. to your whole team: assign emails, discuss internally and reply together. GDPR-compliant, operated in the EU.

Try free for 14 days Book an online appointment

No email migration required · Connect your existing mailboxes and start right away

app.astreo.de

See Astreo in practice

Explore the Astreo app with sample data, without connecting real mailboxes and without sending email.

Request demo access

From 5 € per user and month 100 % hosting in the EU No email migration required Fast full-text search across all mailboxes

“Who is actually answering this right now?”

When several people work with forwards and CC, the overview is quickly lost: who is taking care of which email? Has a reply already been sent? Astreo creates clear responsibilities directly in the shared mailbox.

Unclear responsibility

Without a clear assignment it remains open who takes on a request and handles it.

Duplicate replies

If several people work on an email at the same time, replies can be sent twice.

Open emails slip through

With forwards and CC it is hard to tell which requests are still open or waiting for a response.

Teamwork right inside the mailbox

A shared mailbox with clear responsibilities, internal coordination and secure email handling. Clearly laid out, without helpdesk ballast.

PGP and S/MIME

Sign emails, verify signatures and send and receive encrypted. WKD supports the lookup of public keys.

Assign and handle

Every conversation gets a clear owner. “Assigned to me” shows every user their own cases.

Internal coordination

Coordinate directly on the email thread. Internal messages stay invisible to the sender and the recipients of the email.

Collision detection

Astreo shows when someone is already working on an email. That is how duplicate replies are avoided.

Server-side filters

Rules are applied on the server and therefore work regardless of the device in use.

AI support

Reply suggestions, translations and grammar checking support your writing. Results remain editable drafts and are not sent automatically.

Several mailboxes and email threads

Connect Microsoft mailboxes via OAuth and further mailboxes via IMAP/SMTP. Astreo groups related messages into one email thread.

Fast full-text search

Find emails and email threads across connected mailboxes in a fraction of a second.

What makes everyday email work easier

Signatures

Manage signatures per mailbox and insert them automatically while writing.

Templates

Save recurring email texts as a template and insert them quickly while composing.

Distribution lists

Manage groups of recipients and reach them together under one name.

Out-of-office replies

Set up automatic replies per mailbox and for defined periods.

Contacts

Manage contacts and groups and select them directly while writing.

Calendar

Plan appointments right next to the mailbox and keep them in view.

Blocked senders

Block unwanted senders for the respective mailbox directly from an email.

Light and dark mode

Match the appearance to the system automatically or choose it manually.

Virus protection

Attachments are checked automatically for malware with ClamAV.

Astreo compared with other solutions

Astreo combines the central functions for shared email handling with EU operation and existing Microsoft or IMAP mailboxes.

	Astreo	Front / Missive	Outlook Shared Mailbox
Billing	19 € per user	22-60 € per user	part of the M365 plan
Assignment & chat	✓	✓	-
Collision detection	✓	✓	-
EU hosting	✓	US cloud	depends on tenant
No email migration required	✓	-	-
REST API · Webhooks · MCP	✓	partial	Graph

Feature comparison based on publicly available product information, as of August 2026. Features and prices of the providers named may change.

Astreo pricing

One price per user. Choose the Astreo plan that suits the way you work.

Astreo Inbox

5 € per user/month

For personal email work without shared team functions.

✓Unlimited personal mailboxes
✓Fast full-text search across mailboxes
✓AI reply suggestions and translations
✓PGP and S/MIME
✓REST API, webhooks and MCP

Try free for 14 days

Astreo Team Inbox Starter

12 € per user/month

✓Unlimited personal and shared mailboxes
✓Assign emails and work on them together
✓Internal chat right on the email thread
✓Collision detection
✓Escalations and team reporting

PGP and S/MIME, AI, REST API, webhooks and MCP are not included.

Try free for 14 days

Popular

Astreo Team Inbox

19 € per user/month

✓All features of Astreo Team Inbox Starter
✓AI reply suggestions and translations
✓PGP and S/MIME
✓REST API and webhooks
✓MCP server

Try free for 14 days

Included in every Astreo plan

✓Several mailboxes and email threads
✓Server-side filters & rules
✓Signatures, email templates and out-of-office replies
✓Microsoft (OAuth) and IMAP
✓Virus protection
✓Operation in the EU with backups, updates and system monitoring

Billed per user

Every booked user is billed as a separate licence item. There are no price tiers by team size.

Try without risk

Create an account, no payment details needed. The trial ends after 14 days. You then decide on a plan.

Transparent term

The subscription runs for the monthly or yearly billing period you have chosen.

With yearly payment you use Astreo for twelve months at the price of ten monthly instalments.

All prices are net, plus statutory VAT. Astreo is addressed exclusively to businesses.

Features and services at a glance

Compare what Astreo Inbox, Astreo Team Inbox Starter and Astreo Team Inbox include.

Feature	Astreo Inbox5 € per user/mo	Astreo Team Inbox Starter12 € per user/mo	Astreo Team Inbox19 € per user/mo
Mailbox & everyday work
Several mailboxes, email threads and sending	✓	✓	✓
Server-side filters & rules	✓	✓	✓
Signatures and out-of-office replies	✓	✓	✓
Use email templates	✓	✓	✓
Email distribution lists	✓	✓	✓
Contacts and calendar	✓	✓	✓
Microsoft (OAuth) and IMAP	✓	✓	✓
Virus protection	✓	✓	✓
PGP and S/MIME encryption	✓	—	✓
AI & interfaces
AI replies, translations and text correction	✓	—	✓
REST API	✓	—	✓
Signed webhooks	✓	—	✓
MCP server for AI agents	✓	—	✓
Team collaboration
Shared mailboxes	-	✓	✓
Assign emails	-	✓	✓
Internal chat	-	✓	✓
Collision detection while replying	-	✓	✓
Share email threads and send from shared addresses	-	✓	✓
Team reporting on response and handling times	-	✓	✓
Audit log with seal chain, available for download	-	✓	✓
Central sign-in for organizations (SSO/SAML)	-	Planned	Planned
Operation & support
Operation in the EU with backups, updates and system monitoring	✓	✓	✓
Support	Standard support	Priority support	Priority support
	Try free for 14 days →	Try free for 14 days →	Try free for 14 days →

Not sure which plan suits your team? We are glad to advise you.

Book an online appointment

Data protection and GDPR in focus

Astreo is operated in the EU and helps companies organize shared email mailboxes in a data-protection-compliant way. Clear roles and permissions, documented deletion processes and contractually engaged service providers form the basis for this.

Hosting in the EU

Astreo and the systems required to run it are hosted in the European Union.
Processing on our customers behalf

A data processing agreement and documented technical and organizational measures create a clear basis for processing personal data.
Roles and permissions

Access rights are granted according to the tasks of the users and can be managed within the company.
Deletion and retention

Defined deletion and retention processes govern how long data is needed and when it is removed.
Engaged service providers

Service providers used for operation are contractually engaged and documented transparently in the privacy information.
Technical and organizational measures

Appropriate security measures protect access, systems and the processing of the data.

For developers and AI agents

Integrate Astreo into existing systems

Astreo can be integrated into existing systems and automated workflows via a REST API, signed webhooks and an MCP server. Permissions are granted selectively. Connected systems and AI agents only reach the functions and data released to them.

# Fetch unread threads
curl https://app.astreo.de/api/v1/threads?unread=1 \
  -H "Authorization: Bearer astreo_pat_…"

# AI agent (MCP) proposes drafts -
# but never sends automatically.
mcp.call("draft_reply", { thread_id })

REST API

Connect Astreo to existing applications and individual workflows through clearly limited access rights.

Signed webhooks

Transmit relevant events securely to connected systems and trigger automated processes.

MCP server for AI agents

Give AI assistants access to released functions through clearly defined permissions and have them prepare reply drafts.

Questions & answers

Frequently asked questions

Quick answers to the most common questions about Astreo.

Do we have to migrate our email?

No. Astreo connects your existing Microsoft or IMAP mailboxes. The original emails stay with your current provider. Astreo synchronizes the email data its functions require.

What does the demo show me?

The demo shows Astreo with sample data, without you connecting your own mailboxes or sending email. That way you get to know the interface without obligation before deciding on the 14-day trial.

How does the 14-day trial work?

You create an account and connect your real mailboxes. No payment details are needed for that. The trial ends after 14 days, and you then decide on a plan.

Is our data safe?

Your original emails stay in your Microsoft or IMAP mailbox. So that Astreo can provide search, synchronization and team functions, it processes and stores a server-side copy of the email data required for them. Operation takes place in the EU. The credentials of the connected mailboxes are stored encrypted. Further information on the processing and on the security measures in place can be found in the privacy information.

How is Astreo different from Front or Missive?

Astreo combines assignment, internal coordination and collision detection with EU operation, PGP and S/MIME as well as existing Microsoft or IMAP mailboxes. Front and Missive offer a similar workflow but run in the US cloud. Features and prices of the providers named may change.

Where does the AI in Astreo support us?

Astreo uses Mistral for reply suggestions, translations and grammar and text correction. The source language is detected automatically, and defined style rules can be taken into account when phrasing. All results remain editable drafts and are never sent automatically.

What happens to our data if we cancel?

Your original emails stay in your Microsoft or IMAP mailbox. Data processed for the functions of Astreo is handled according to the agreed retention and deletion periods. You will find the details in the data processing agreement and in the privacy information.

Bring your info@, support@ & co. to your team.

Try free for 14 days, or get to know Astreo right away in the demo.

Try free for 14 days Request demo access

Demo with sample data, trial with real mailboxes - both without obligation and without payment details.