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tremendousligam
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Joined: 06 June 2024
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| Posted: 06 June 2024 at 2:27am | IP Logged
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Hello,
I am looking for an email web client, open source code.
It has to work with Microsoft Exchange.
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Igor
AfterLogic Support
Joined: 24 June 2008
Location: United States
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Posts: 6189
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| Posted: 06 June 2024 at 2:32am | IP Logged
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Take a look at WebMail Lite PHP, it is opensource community edition of the Pro version. It can work with any IMAP/SMTP server including MS Exchange as long as it supports the use of basic authentication (username/password).
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Regards,
Igor, Afterlogic
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isibilitytease
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| Posted: 15 April 2026 at 9:21pm | IP Logged
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SOGo is the best open-source webmail client with Microsoft Exchange support, while most others only work via IMAP.
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Prutux
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| Posted: 20 September 2026 at 1:23pm | IP Logged
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Claude finished the response
Drafting a forum reply about open source Exchange-compatible email clients.
Voici une réponse prête à poster, en anglais puisque le sujet est en anglais :
Hello,
Roundcube is probably the safest starting point. It's open source (PHP), very mature, and works with Exchange through IMAP/SMTP. SnappyMail is a lighter, more modern alternative that works the same way.
Before recommending anything more precise, a few questions, because the answer depends on your setup:
Is your Exchange on-premise or Exchange Online (Microsoft 365)? This matters a lot right now. Microsoft is starting to block EWS in Exchange Online on October 1, 2026, with a full shutdown planned for April 2027. Any client built on EWS is a bad bet on the cloud side. For Exchange Online, you need IMAP/SMTP with OAuth2, or Microsoft Graph.
Do you only need email, or also calendar and contacts? Roundcube and SnappyMail cover email well, but calendar and contacts on Exchange are much harder with IMAP alone. For the full set, a custom client built on Microsoft Graph is the cleaner route.
Do you need to modify the code, or just host and use it? "Open source" can mean either, and the choice changes the approach.
If it's on-premise Exchange with IMAP enabled and email only, Roundcube can be up and running quickly. If it's Microsoft 365, it's still feasible, but it needs a proper OAuth2 setup in Azure/Entra ID.
Let me know your setup and I can be more specific.
Best regards
Cette réponse donne une vraie piste et montre que vous maîtrisez le sujet. Les trois questions permettent aussi de relancer la discussion avec le client.
En paragraphe, soit court
Voici la version courte, en un seul paragraphe :
Hello, Roundcube is a solid open source starting point (PHP, very mature) and works with Exchange through IMAP/SMTP; SnappyMail is a lighter alternative. The right choice depends on your setup, though: is your Exchange on-premise or Exchange Online (Microsoft 365)? For the cloud version, you'll need OAuth2 or Microsoft Graph, since Microsoft starts blocking EWS on October 1, 2026, so avoid any client built on it. Also, do you only need email, or calendar and contacts too? For the full set, a custom client using Microsoft Graph is the cleaner route. Let me know your setup and I can be more specific.
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