Hello, right now, we use SYMPA for Mailing lists, but would like to switch over to Lists within our Exchange Server because we want to be able to invite the List to an appointment without knowing / selecting all the members. Problem is: we have private Keys for some of the Mailinglists, and corresponding public keys within our PKI. Sympa gets the encrypted Mail, decrypts, and encrypts for each of the members of the Mailinglist again. Can Exchange do this also ? Can i configure Exchange / GAL to send the Mail for the Exchange List over to SYMPA, but still resolve the individual Members in case of an appointment invitation ? thanks

As far as your question probably not if Sympa expects to get an encrypted mail from the Exchange server. If your clients are required to send to Sympa using the public key to encrypt then it will likely also require Exchange to encrypt. Mail servers will support TLS aka SSL for encrypting just the transport of the message from mail server to mail server and not end to end client to client. Your best bet is to work with the Sympa vendor for documentation and guidance.James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

Hello, sympa wont expect anything. my question was: can exchange do the same as sympa (decrypt with private key, encrypt for members with their public keys) , or can exchange send mails adressed to GAL Mailinglists out to somewhere else(sympa) ( without resolving the individual members email adresses ) , but still keep invitations for appointments going for that mailinglist

Exchange does not do end to end encryption for clients (only for mail server to mail server using TLS) so the first answer to your question is no. Yes Exchange can send to a GAL mailing list without knowing it's members, you can create an external contact in Exchange for the mailing list and once Sympa gets it, it should be able to disperse the meeting request to it's members using PKI. James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

Hello Jamestechman, can i use this external contact for invitations then with multiple users acknowledging or not without confusing the calendar parts of exchange ? thanks

Yes what will happen is you send a meeting request to this external contact, the email gets sent to your sympa which will send the meeting invite to the members (which members could be gmail, yahoo etc) The users will get the meeting invite with ics attachment. They accept and gets added. Since these are external you will not see any free busy since this is a contact object. But if you send an updated invite with different time it will get resent and the time will get updated on the end users calendar (no duplicate) Now this is how sending email to external contacts works sending to an external mail server, since you're using a mailing list (symp) I'm not sure if there are any restrictions such as sending meeting objects etc. James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

thanks for the clarification, think that should help