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the Subject always has to be encoded. Have a look at UTL_ENCODE.MIMEHEADER_ENCODE
To find out about this it also might be helpful to view the raw text of a mail sent from your personal mail client (Most clients can, but I think Outlook cannot). The subject line should look similar to
For a german subject line "Fahrplanänderungen KBS 930 München - Landshut - Regensburg"
Subject: =?iso-8859-1?Q?Fahrplan=E4nderungen_KBS_930_(M=FCnchen_-_Landshut_-_Regen?= =?iso-8859-1?Q?sburg)?=