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  • From: Chris Kay <address@concealed>
  • To: "address@concealed" <address@concealed>
  • Subject: Re: [en@sympa] Pre-planning questions
  • Date: Wed, 10 Apr 2024 19:02:55 +0000

As a follow-up for those with Exchange Online in-house, how do you handle:

  • Integration with GAL
  • Using Sympa groups (especially ones with nested Exchange DLs) for Outlook calendar invites?



From: Chris Kay <address@concealed>
Date: Wednesday, April 10, 2024 at 11:12
To: address@concealed <address@concealed>
Subject: Pre-planning questions

Hello all!


I’ve been tasked with setting up Sympa as a POC in my company. Here are some specifics:

  • Proofpoint is our spam/malware gateway
  • Office 365/Exchange Online is our mail service; we already have a bunch of DLs, M365 groups, etc.
  • Okta is our IDP


Here’s what I’d like to accomplish:

  • Login does not require being on VPN, but does prompt user for Okta credentials
  • We’ll use subdomain like and point MX to Proofpoint


Here are a few questions:

  • How do I nest EXO/M365 groups in Sympa lists? Just use email address and make sure it is able to accept external email?
  • How do I integrate Sympa lists into our Global Address List (GAL)?
  • Anyone have experience using Okta, perhaps with CAS?
  • I’m pretty sure the Proofpoint workflow will work but does anyone have experience with that setup?


That’s all for now.




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