I have a small test installation running, on which I (try) to recreate all the functions of an Exchange environment that is to be replaced.
Fortunately, all rudimentary mail requirements are met and ActiveSync clients can also be integrated without any problems.
Unfortunately, I fail at a small but important function: mailing lists.
So far I have been able to include external email addresses (contacts in the exhange terminology) in the groups of recipients without any problems. These external list members could send mails to the list and of course received every mail to the list.
Unfortunately, that doesn't seem to be possible in Grommunio. Is there a workaround?