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The following list shows all approved and requested mail apps for Exchange Online.

The permissions and privacy policies of each requested mail app are checked. If app permissions are too extensive or data is not handled in accordance with ETH guidelines due to the privacy policy, the Cloud Service Center reserves the right not to approve mail apps.

Mail apps are generally approved, i.e., there is no self-registration.

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Mail-App                  

Initial Requester

Approver / Rejecter

Status

Supported by ID

Permissions

Date

Notes

Link to Privacy Policy

App-ID

FastMail

OPEN

(question) 

IMAP.AccessAsUser.All
SMTP.Send

 

Datenstandort:

Fastmail betreibt seine Server ausschliesslich in Australien (Sydney, Melbourne).
Quelle: Fastmail DPA Annex 2 – Data Location

Kein Angemessenheitsbeschluss:
Australien hat keinen Angemessenheitsbeschluss nach EU-DSGVO oder CH-DSG.

Fehlende Standardvertragsklauseln für EU/CH-Transfers:
Fastmail verweist zwar auf ein DPA, nennt aber keine implementierten EU-Standardvertragsklauseln (SCCs) für Datenübermittlungen aus der EU oder Schweiz.
Quelle: Fastmail DPA

Unklare Drittlandübermittlungen:
Laut DPA darf Fastmail Kundendaten „an jedes Land oder Territorium“ übertragen, wenn es für den Betrieb notwendig ist.
Quelle: Fastmail DPA Annex 1

 


HEY

APPROVED

(question) 

Delegated permissions:

offline_access

Mail.Send

 

We are compliant with GDPR and you can check out all the details here: https://basecamp.com/about/policies/privacy.
Specifically this section:
When transferring personal data from the EU
The European Data Protection Board (EDPB) has issued guidance that personal data transferred out of the EU must be treated with the same level of protection that is granted under EU privacy law. UK law provides similar safeguards for UK user data that is transferred out of the UK. Accordingly, 37signals has adopted a data processing addendum with Standard Contractual Clauses to help ensure this protection. 37signals’ DPA is available at https://basecamp.com/about/policies/privacy/regulations/basecamp-gdpr-dpa.pdf.
There are also a few ad hoc cases where EU personal data may be transferred to the U.S. in connection with 37signals operations, for instance, if an EU user signs up for our newsletter or participates in one of our surveys or buys swag from our company online store. Such transfers are only occasional and data is transferred under the Article 49(1)(b) derogation under GDPR and the UK version of GDPR.

https://37signals.com/policies/privacy


Thunderbird Android

many

APPROVED

(question)

IMAP.AccessAsUser.All

SMTP.Send

offline_access

 

Approved, as these are delegated permissions and refer to the same privacy policy as the Thunderbird app for desktop.

https://www.mozilla.org/en-US/privacy/

e6f8716e-299d-4ed9-bbf3-453f192f44e5

Thunderbird with Owl

APPROVED


(question) 

offline_access

EWS.AccessAsUser.All

 


Thunderbird Add-On

Gebaut wird das Plugin von Beonex in D: https://www.beonex.com/owl/

Datenschutzerklärung: https://www.beonex.com/owl/privacy

EULA: https://www.beonex.com/owl/eula

d7fd83df-b1e8-40fa-a2fe-d23c44baa758

Fantastical (Flexibits)

APPROVED

(error)


offline_access

openid

profile

email

Calendars.ReadWrite

Calendars.ReadWrite.Shared

Tasks.ReadWrite

Tasks.ReadWrite.Shared

User.ReadBasic.All

User.Read

People.Read

MailboxSettings.Read

EWS.AccessAsUser.All

 


Mac Client 

https://flexibits.com/privacy/faq





K-9

APPROVED

(error)


IMAP.AccessAsUser.All

SMTP.Send

offline_access

 


https://k9mail.app/


Android mail client (developed by Mozilla Thunderbird)




https://k9mail.app/privacy.html





Microsoft Outlook


n.a.



n.a.





APPROVED


(tick)







MS Outlook is enabled by default.








Thunderbird (Mozillla)


Brosche Michel (ID) 



Consani Fabio 


APPROVED


(error)


offline_access

SMTP.Send

IMAP.AccessAsUser.All

POP.AccessAsUser.All


 


Good IMAP client available on all OS'es


https://www.mozilla.org/en-US/privacy/



 


Apple Internet Accounts (Apple)



Brosche Michel (ID) 

Corti Matteo (ID) 

Fazzone Dimitrios (ID) 


Consani Fabio 

APPROVED


(tick)


offline_access

openId

EWS.AccessAsUser.All

EAS.AccessAsUser.All


 


To access EXO with iOS devices, this application must be approved.


Most common mail client at ETHZ. Used in MacMail and iOS Mail

https://www.apple.com/legal/privacy/...

 

GNOME Evolution (Gnome)

Corti Matteo (ID) 

Signer Paul (ID) 

APPROVED


(error)


offline_access

Calenders & Contacts

Mailbox & Mail

Tasks

EWS.AccessAsUser.All

User.Read

User.ReadBasic.All




 


Last update on  


Only Linux client with full calendar integration!

Linux Mail Client released

Evolution requires a lot of permissions. One critical example is

“Calendars.ReadWrite,” which potentially allows access to all calendars.

Statement from documentation (Microsoft Graph permissions reference): Administrators can configure application access policy to limit app access to specific mailboxes and not to all the mailboxes in the organization, even if the app has been granted the Calendars.ReadWrite application permission.

This means that EXO must ensure that Evolution cannot view all calendars!


Last update: User.Read & User.ReadBasic.All have been added. These permissions are necessary for shared mailboxes.


https://www.gnome.org/privacy-policy/

 

Nine for Office 365


Corti Matteo (ID) 



Signer Paul (ID) 





APPROVED


(error)


EWS.AccessAsUser.All


 



https://www.9folders.com/privacy-policy/


Alpine Mail Client

Corti Matteo (ID) 


Signer Paul (ID) 





APPROVED


(error)


offline_access

SMTP.Send

IMAP.AccessAsUser.All




This page is wrong formatted.

https://alpineapp.email/


Gmail (Google)


Corti Matteo (ID) 



Signer Paul (ID) 





APPROVED


(tick)


offline_access

EAS.AccessAsUser.All


 


Common mail client on Android devices

 https://policies.google.com/privacy?gl=CH&hl=en


Samsung Email (Samsung)


Dunkl Apon (ID) 

Signer Paul (ID) 





APPROVED


(error)


offline_access

openid

email

profile

EWS.AccessAsUser.All

Calendars.ReadWrite


 


Standard mail client on Samsung Android devices. Usage couldn't be identified based on existing Exchange-Logs.

There are many requests, but all these people are not yet migrated to cloud

 https://account.samsung.com/membership/policy/privacy


Mutt E-Mail Client


Corti Matteo (ID) 



Signer Paul (ID) 


APPROVED


(error)


offline_access

SMTP.Send

IMAP.AccessAsUser.All

POP.AccessAsUser.All


 


Mutt is a small but very powerful text-based mail client for Unix operating systems

Can't find privacy policy.

(Aires: because, it runs locally on the PC)

 

Provider for Exchange ActiveSync for Office 365


Crespo de la Serna Felix (ID) Simic Dragan (ID) 



Dunkl Apon (ID) 


APPROVED


(error)


EAS.AccessAsUser.All



 


Is mentioned here:

Linux 4 Departments -> Email

No Privacy Policy, but URL to GitHub:

https://github.com/jobisoft/EAS-4-TbSync/wiki/About:-Provider-for-Exchange-ActiveSync

2980deeb-7460-4723-864a-f9b0f10cd992

BlueMail (Blix  Inc.)

n.a.


Corti Matteo (ID) 





BLOCKED


(error)


User.Read
EAS.AccessAsUser.All
Exchange.Manage


 


Requires manage exchange configuration API right

 https://bluemail.me/privacy/


QQMail (Tencent Technology (Shenzhen) Company Ltd.)

n.a.


Corti Matteo (ID) 





BLOCKED


(error)




 


Known data kraken from China (TikTok Publisher)

 https://play.google.com/store/apps/datasafety?id=com.tencent.androidqqmail&hl=en_US


LGEmail

n.a.


Signer Paul (ID) 

Dunkl Apon (ID) 





BLOCKED



(error)


.default


 


Can't find official Homepage

Can't find privacy policy.

66327e7a-d195-41bd-9628-6a0ee1bc3c06

Spark Mail (Spark Mail Limited)

 n.a.


 Dunkl Apon (ID) 





APPROVED




offline_access
openid
email
profile
EWS.AccessAsUser.All
Calendars.ReadWrite


  



https://sparkmailapp.com/legal/privacy-web


Canary Mail (CanaryMail)


Dunkl Apon (ID) 




BLOCKED




(error)  

EWS.AccessAsUser.All
openid
offline_access
profile




 


No information about the data location found, therefore not approved.


How we transfer information we collect internationally

The information we collect is stored on our servers in Germany. Germany has been recognized by the European Commission as offering and an adequate level of data protection such that personal data can flow from the EU to that country without any need for further safeguards.

Some of the third parties described in this privacy policy, which provide services to us under contract, are based in other countries that may not have equivalent privacy and data protection laws to the country in which you reside. By using our Services, you consent to any transfer and processing in accordance with this policy. Whenever we transfer your information, we take steps to protect it."

https://canarymail.io/privacy-policy

https://canarymail.io/privacy.html


DavMail








OPEN




.default





Can't find privacy policy.

facd6cff-a294-4415-b59f-c5b01937d7bd

EmailJS








OPEN




mail.send

openid

email

offline_access





https://www.emailjs.com/legal/privacy-policy/#data-collection

https://www.emailjs.com/legal/privacy-policy/#data-subprocessors

76a1856d-bcdd-40a8-b482-c3010de1d2c1

AquaMail





BLOCK

(error)

openid

email

offline_access

IMAP.AccessAsUser.All

POP.AccessAsUser.All

SMTP.Send







 

Data Location of Personal Information process is in the US:

https://www.aqua-mail.com/privacy-policy/

c40fc214-9304-4d8b-83e7-d29db7798e35

EdisonMail


Carreira e Marques Aires Manuel (ID) 






BLOCK




EWS.AccessAsUser.All

offline_access

profile

openid


 




Data Location of Personal Information process is in the US:

z

https://www.edisonmail.com/privacy-commitments

62db40a4-2c7e-4373-a609-eda138798962

OnMail








OPEN




offline_access

openid

email

IMAP.AccessAsUser.All

SMTP.Send





https://www.edisonmail.com/privacy

be975a90-8235-4503-afe3-88ccb690750f

FairEmail








OPEN




profile

openid

email

offline_access

IMAP.AccessAsUser.All

SMTP.Send

POP.AccessAsUser.All





https://email.faircode.eu/privacy/

17e57eca-a59b-4574-ac91-b343004898a6

Mail App for Outlook








OPEN




IMAP.AccessAsUser.All

SMTP.Send

openid

profile

offline_access





https://intrepidcorp.co.uk/mailappforoutlook//privacypolicy.html

11680cd6-7ad2-44de-bb9f-665024d48a72

Mailspring








BLOCKED


(error)

user.read

offline_access

Contacts.ReadWrite

Contacts.ReadWrite.Shared

Calendars.ReadWrite

Calendars.ReadWrite.Shared

IMAP.AccessAsUser.All

SMTP.Send





 

Data Location of Personal Information process is in the US:


https://www.getmailspring.com/privacy-policy

8787a430-6eee-41e1-b914-681d90d35625

Foxmail






Carreira e Marques Aires Manuel (ID) 




BLOCKED




offline_access

openid

email

profile

IMAP.AccessAsUser.All

SMTP.Send

POP.AccessAsUser.All

EAS.AccessAsUser.All

EWS.AccessAsUser.All




Company behind Foxmail is Tencent.

https://www.foxmail.com/win/en/privacy_policy.html

https://www.foxmail.com/win/en/privacy_policy.html#infocollect

231575bc-9f6c-4539-9241-5cfae696b630

BusyCal


Panyasantisuk Jarunan (ID) 


APPROVED



(error)  

EWS.AccessAsUser.All

Calendars.ReadWrite

Tasks.ReadWrite

Tasks.ReadWrite.Shared

User.Read

People.Read

MailboxSettings.Read

Calendars.ReadWrite.Shared

User.ReadBasic.All

openid

profile

offline_access


 


Using our software enables you and your organization to meet GDPR regulatory requirements. Any data entered into our apps, including Personally Identifiable Information (PII) or Protected Health Information (PHI), is never transferred, saved, or stored on our servers. All data remains on your device or with the third-party services you choose to sync with (such as iCloud, Google, Microsoft Office etc.) ensuring your information stays under your control at all times.

https://www.busymac.com/privacy.html

885773d6-1859-4189-9b95-b9128fe95ae1

BusyContacts

Panyasantisuk Jarunan (ID) 

APPROVED

(error) 

Contacts.ReadWrite
Contacts.ReadWrite.Shared
MailboxSettings.Read
People.Read
User.Read
User.ReadBasic.All
profile
openid
offline_access


 


  • BusyContacts: Access to your Contacts is required to autofill addresses, names, and numbers as needed. It also uses your "Me Card" to accurately identify you and allow changes to your contact card. Like BusyCal, BusyContacts does not collect or upload your contact details to its servers.

Our apps are designed to align with various global privacy and security regulations. While we do not process, store, or transmit user data on our servers, we follow best practices that support compliance with:

  • GDPR (General Data Protection Regulation) – Ensures all data remains on your device or with the third-party services you choose to sync with.
  • HIPAA (Health Insurance Portability and Accountability Act) – Our software does not process Protected Health Information (PHI). If you use our apps in a healthcare setting, you must ensure that your chosen sync service meets HIPAA compliance requirements.
  • CCPA (California Consumer Privacy Act) – We do not collect, sell, or share personal data.

https://www.busymac.com/privacy/

b32508e6-e213-4601-a59e-a62413a700b6

Superhuman



OPEN


 





Claws Mail


Dunkl Apon (ID) 


APPROVED

(error)  

offline_access
SMTP.Send
IMAP.AccessAsUser.All
POP.AccessAsUser.All
Mail.ReadWrite
Mail.Send
User.Read




 


https://www.claws-mail.org/faq/index.php/Oauth2#Setting_up_OAuth_2.0_for_Microsoft_-_for_Outlook_or_Exchange

https://lists.claws-mail.org/pipermail/users/2024-September/033312.html


MailMate


Dunkl Apon (ID) 


APPROVED

(error)  

 IMAP.AccessAsUser.All

SMTP.Send

offline_access


 


1 user requested so far

2024-10-31 - Aires - Privacy policy is ok

OTRS Ticket

https://freron.com/privacy_policy/

2316c52f-c664-4efb-93c2-830b1ba5f128

TypeApp

Sommer Georg

Professor Andreas Hierlemann


Carreira e Marques Aires Manuel (ID) 





BLOCKED

(error)  

 

 


https://typeapp.com/privacy/


SailfishOS Mail


Panyasantisuk Jarunan (ID) 

APPROVED

(error) 

offline_access
openid
email
EAD.AccessAsUser.All

 




Full Fabric


Dunkl Apon (ID) 


APPROVED


IMAP.AccessAsUser.All

offline_access

 

Approved by CISO

https://www.fullfabric.com/privacy-policy


Calendly

 

Panyasantisuk Jarunan (ID) 


APPROVED

(error) 

openid
email
profile
offline_access
User.Read
Calendars.ReadWrite
Calendars.ReadWrite.Shared

 

 The data would be stored in the US. https://calendly.com/legal/privacy-notice. Clarifying with CISO



Morgen.so

 


Carreira e Marques Aires Manuel (ID) 







APPROVED




Sync all calendars



Any.do

Panyasantisuk Jarunan (ID) 




BLOCKED




Data location in Israel

https://www.any.do/legal/privacy-policy


Calendar Bridge

 

Panyasantisuk Jarunan (ID) 

BLOCKED




Data location in the US



Huawei Email App


 Carreira e Marques Aires Manuel (ID) 



BLOCKED



 

Data location in China




WeekCal


Panyasantisuk Jarunan (ID) 

REJECTED

It could be reviewed again as the cloud app provider us SCCs.


(error) 


 

Data maybe transferred outside of Europe. 

 Updated: Using SCCs

VII. International Transfer 

We may transfer your Personal Information outside the European Union/European Economic Area. Whenever we transfer your Personal Information out of the EU/EEA, we ensure an adequate level of protection is afforded to it by ensuring, where required by law, at least one of the following safeguards is implemented:

  • Transferring Personal Information to countries that have been deemed to provide an adequate level of protection for Personal Information by the EU Commission, or
  • Using standard contractual clauses approved by the EU Commission which give Personal Information the same protection it has in Europe.
https://maplemedia.io/privacy/

Postbox


Dunkl Apon (ID) 


APPROVED

(question)

Delegated Permissions:

IMAP.AccessAsUser.All

POP.AccessAsUser.All

SMTP.Send

offline_access

 

Postbox fka "em Client"

https://www.postbox-inc.com/legal/privacy

3f22d358-8176-496b-9559-8c8e1101fbca

Em Client



Carreira e Marques Aires Manuel (ID) 


APPROVED



 


https://www.emclient.com/privacy-policy



Kontact 



Carreira e Marques Aires Manuel (ID) 


APPROVED



 

The privacy policy states that sensitive information such as user names, passwords, and personal information (including events, contacts, emails, etc.) obtained from remote services is stored locally on the user's computer.



Mailbird


REJECTED



 

13. INTERNATIONAL DATA TRANSFER Your information, including personal data that we collect from you, may be transferred to, stored at and processed by us and our affiliates and other third parties outside the country in which you reside, including, but not limited to the United States, where data protection and privacy regulations may not offer the same level of protection as in other parts of the world. By using our Services, you agree to this transfer, storing or processing.] We will take all steps reasonably necessary to ensure that your data is treated securely and in accordance with this Policy.

21. EU-U.S. PRIVACY SHIELD Mailbird Inc. commits to cooperate with the panel established by the EU data protection authorities (DPAs) and comply with the advice given by the panel with regard to personal data transferred from the EU. Please contact us to be directed to the relevant DPA contacts. As further explained in the Privacy Shield Principles, binding arbitration before a Privacy Shield Panel will also be made available to you in order to address residual complaints not resolved by any other means. Mailbird Inc. is subject to the investigatory and enforcement powers of the U.S. Federal Trade Commission.

https://www.getmailbird.com/privacy-policy/