We upgraded our company's Zimbra Community Edition installation a couple of days ago and we've been having some troubles ever since with the headers of some incoming mail messages, they are encoded in ISO-8859-15 quoted printable encoding. All the international letters (I say again, quoted printable, this shouldn't be happening) are replaced with a question mark symbol.
We upgraded from 5.0.18 where this was not a problem.
I have only confirmed this in the web client as I do not use an off-line client.
Example (taken from the source of the e-mail by 'Show Original'):
The subject should say (in a perfect world):
Subject: Verkbei�ni �thluta� til ��n
Original subject header (from the sender):
Subject: Verkbeini ˙thluta til ■Ýn
Originally the e-mails were not encoded in this style from the sender (automatic system), they were written in iso-8859-15 encoding with no quoted printables. Zimbra (5.0.18) had a problem with displaying the international characters correctly (converting them from iso-8859-15 to utf-8) so I had to change the source code of the report system so that it sends quoted printable encoded emails instead of plain iso-8859-15.
To make sure that this was not something connected to the upgrade, I set up a new test server (6.0.3) on a different site and sent an e-mail using the same reporting utility to that server. The e-mail was displayed precisely in the same manner as on the production e-mail server.
I have not found any relevant post or bug that can explain this or resolve this.
Do any of you believe that I can change this behavior by some configuration parameters (perhaps Java configuration)?
Has this been an issue for anyone else (and if so, what did you do to resolve it)?
If I send an e-mail using no quoted printable encoding on an iso-8859-15 encoded email with international characters (Š■ for instance), Zimbra Web access displays the international characters in the subject and body as a question mark symbol > in the list view, but the quick preview displays the international characters in the body correctly but displays question mark symbols for each international character in the subject.