When I reply to an email using Webmail, the subject appears to be rewritten correctly to prepend "RE:". But after I click send the "RE:" is removed and sent with just the original subject. This is visible when looking in the "sent items" folder and from viewing emails in the recipients inbox that were replied to with the webmail client. Emails replied to from an Activesync client (iPhone and Outlook) do not remove the "RE:" from the subject.
When I examine the headers by right-clicking on the sent message in webmail and selecting "options", the "Internet Headers" section is empty on emails that I replied to in webmail (Sent Items folder). Emails that I replied to with an activesync client do include valid headers when examined in webmail.
I'm running the latest nightly as of 3/1/2023 but I've seen this behavior prior to this release.
grommunio Web: 22.214.171.12430eaa-lp154.186.1