Der User deajan beschreibt im Kommentar ziemlich genau unser Problem:
Sorry to inform you, but when sending emails via ews (outlook for mac / mac mail), I still get duplicate "To" recipients in some cases.
Before this commit, I got duplicate "To"s for every sent message.
Now I only get them from certain senders who send mails internally (to others on same grommunio server).
I've tried to see why some senders had duplicates and others don't, without finding any significate difference.
