Beim Erstellen eines iCal-Ereignisses im Auftrag eines Veranstalters und E-Mail-Versand werden keine Wrapper für "Zum Kalender hinzufügen" oder "RSVP" angezeigt

Ich erstelle den iCal mit ical4j und sende ihn mit der Java Mail API 1.4.7. Wenn Sie es sowohl an google.mail als auch an outlook.com senden, erhält der Organisator nur den Textteil der E-Mail. Alle anderen Empfänger erhalten die E-Mail mit den Schaltflächen "Zum Kalender hinzufügen" oder "Antworten" (für Teilnehmer).

Wenn der Empfänger die E-Mail aus der Organisator-Eigenschaft entfernt, erhält er die E-Mail mit den Wrappern, aber die Besprechung hat keinen Organisator ...

Mein Problem dabei ist, dass der Organisator, für den ich die Veranstaltung erstellt habe, die Veranstaltung nicht in seinem Kalender erstellt bekommt.

Das ist die E-Mail gesendet:

Delivered-To: [email protected]
Received: by 10.202.80.11 with SMTP id e11csp2599297oib;
        Wed, 24 Feb 2016 11:28:44 -0800 (PST)
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        Wed, 24 Feb 2016 11:28:44 -0800 (PST)
Return-Path: <[email protected]>
Received: from o1.email.highr.io (o1.email.highr.io. [50.31.35.179])
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Date: Wed, 24 Feb 2016 19:28:52 +0000 (GMT)
From: "(DevEnv) Woo.io" <[email protected]>
Reply-To: "(DevEnv) Woo.io" <[email protected]>
To: [email protected]
Message-ID: <1211793890.13.1456342132980.JavaMail.User1@JohnK-Laptop>
Subject: A phone call with John Doe has been scheduled
MIME-Version: 1.0
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Hey John,<br/>
<br/>
Your phone call with <a href="http://maillink.highr.io/wf/click?upn=3ibeNM06sk3hwkvcie1DPBgy7cYOOttXS5-2BLoUaPtsOGqA59P5fO6daaC-2FElTpb18Jugca5lJfpp-2FaXIMttD6y5tgiFSow1UHrY3IIYaewFK2XreFYpGrANelHjqpiNmFB8f-2B-2BXzyGI-2FVlZNml60HYdo3DbLqHdoCX6HFNrW4YOs4JLSzMBrGeqED36P1mZ-2F-2BjFL5-2Fib02yimGdsxKGC7HVsnrOQWPh-2FWbZ7frPksnbvjEid588BXSVaA7hlKB1jL1-2F5PBv1K8s06lX4apnVoZbVUE-2FZQGCsMdk9W7R8gfjaN77nlCHj5KFhMYJwVDBZ_GdV8Hrdq-2BQbZs-2Fm93FPKckJV25NkkcUaolDJXkLlnpBg0Xbct0oKET0-2FnwIfl-2BW7eIwP1p0BhqiEyHB7UrRv7OOu8HKK2-2BClqqKJ-2F27-2BP2RlYB-2BEG5zIRJ6dXp3aE-2BCGj3b1q9XNiBMKQfgXg45DWm-2FxEHF3n0Te-2FcoKzoZ1LjgLS09b17G8wvKVGxY9QqaiCnkZ4-2By04QexB6yqM2D5fbpw6Vh8eeC41BXZufR3yawoYbkTpD00YbswRH2RXS-2FP7KJwJIRQJ6A0Xkh-2BEe7Lks-2FVS9yQG0u0VUEPrSPkvmne9JwGqAC5hP0BnvDJOVO3T2qICMwKZhII6abrGmw9qA-3D-3D" target="_blank">John Doe</a> for the Software Engineer position is scheduled for Thu, Feb 25, 2016 at 08:00 (GMT+2).<br/>
<br/>
We've let the candidate know that you will call them at this number 97211111112.<br/>
<br/>
Cheers,<br/>
The WOO Team<img src="http://maillink.highr.io/wf/open?upn=GdV8Hrdq-2BQbZs-2Fm93FPKckJV25NkkcUaolDJXkLlnpBg0Xbct0oKET0-2FnwIfl-2BW7eIwP1p0BhqiEyHB7UrRv7GqRg7jOp-2BAbQ2UPQH8bOgR-2FU-2FYLgxBsp0t-2BhtjHYTwIYSWbbiCB-2BX9fFdgJLwjjGviXI7Cv1G-2BojfLNKLqM716xBEEEOZt-2FmF05l9JwEHcX4yP1PTaZsbx8eeU2Su6yBDIr28ZQtbVkglHvfp-2BNkqyRWTvbCj8zIiCwlLgdBc069-2Bo7RRFPqYxrxciYHJknt2ealaYUMX52-2BceFyyau8EPxjnbU508-2FI2pd8breJeYGh7khtRHOJYDT5J0SQ9ztqBSFTeNARQ1CHhBpcP04zgk-3D" alt="" width="1" height="1" border="0" style="height:1px !important;width:1px !important;border-width:0 !important;margin-top:0 !important;margin-bottom:0 !important;margin-right:0 !important;margin-left:0 !important;padding-top:0 !important;padding-bottom:0 !important;padding-right:0 !important;padding-left:0 !important;"/>

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BEGIN:VCALENDAR
PRODID:-//Google Inc//Google Calendar 70.9054//EN
VERSION:2.0
CALSCALE:GREGORIAN
METHOD:REQUEST
BEGIN:VEVENT
DTSTAMP:20160224T192852Z
DTSTART:20160225T060000Z
DTEND:20160225T063000Z
SUMMARY:John Doe <> Highr.io - Interview
ORGANIZER;CN=Woo.io:MAILTO:[email protected]
ATTENDEE;CN=John Doe 1st;PARTSTAT=ACCEPTED;RSVP=TRUE:MAILTO:Johnk@hig
 hr.io
ATTENDEE;CN=John Doe;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;ROLE=REQ-PARTICI
 PANT:MAILTO:[email protected]
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END:VEVENT
END:VCALENDAR

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Eine Idee, warum es sich so verhält und wie man das löst?

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