eMail Posteingang „failed to parse“

Moin,
ich habe folgenden Fehler, für den ich keine Lösung finde:
Meine eMail Adresse habe ich bei Strato und im j-lawyer via imap eingerichtet. Das Senden und Empfangen funktioniert auch. Allerdings erhalte ich bei empfangenen eMails von bestimmten Absendern die Fehlermeldung „Fehler beim Laden der Nachricht: failed to parse:“. Die eMail wird in der Übersicht mit Betreff, Absender, Empfänger usw. angezeigt. Der Inhalt wird aber nicht dargestellt, auch nicht über Rechtsklick und öffnen im externen eMail Programm. Die so geöffnete eMail ist leer.
In Outlook selbst hingegen werden die eMails korrekt angezeigt. Allen eMails mit dieser Fehlermeldung ist gemeinsam, dass die Absender Bilddateien in ihrer Signatur haben. Allerdings werden eMails von anderen Absendern, die auch Bilddateien enthalten, feherfrei dargestellt.

Bin für jeden Rat dankbar. Viele Grüße Christopher Borchers

Hier ein Auzug aus dem Protokoll des clients mit dem Fehler:
2022-06-01 15:09:28,079 INFO [com.jdimension.jlawyer.client.mail.EmailInboxPanel] 0 unread emails event has been published
2022-06-01 15:09:50,000 ERROR [com.jdimension.jlawyer.client.mail.MailContentUI] Error getting contents of IMAP message
java.lang.IllegalArgumentException: failed to parse:
at java.awt.datatransfer.DataFlavor.<init>(DataFlavor.java:432) ~[?:?]
at javax.activation.ActivationDataFlavor.<init>(ActivationDataFlavor.java:64) ~[j-lawyer-cloud.jar:?]
at com.sun.xml.ws.encoding.ImageDataContentHandler.<init>(ImageDataContentHandler.java:43) ~[rt-2.3.3.jar:2.3.3]
at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:?]
at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:?]
at java.lang.reflect.Constructor.newInstance(Constructor.java:490) ~[?:?]
at java.lang.Class.newInstance(Class.java:584) ~[?:?]
at javax.activation.MailcapCommandMap.getDataContentHandler(MailcapCommandMap.java:601) ~[j-lawyer-cloud.jar:?]
at javax.activation.MailcapCommandMap.createDataContentHandler(MailcapCommandMap.java:555) ~[j-lawyer-cloud.jar:?]
at javax.activation.CommandMap.createDataContentHandler(CommandMap.java:205) ~[j-lawyer-cloud.jar:?]
at javax.activation.DataHandler.getDataContentHandler(DataHandler.java:597) ~[j-lawyer-cloud.jar:?]
at javax.activation.DataHandler.getContent(DataHandler.java:524) ~[j-lawyer-cloud.jar:?]
at javax.mail.internet.MimeBodyPart.getContent(MimeBodyPart.java:683) ~[javax.mail-1.6.2.jar:1.6.2]
at com.jdimension.jlawyer.client.mail.MailContentUI.recursiveLoadInlineImages(MailContentUI.java:1476) ~[j-lawyer-client.jar:?]
at com.jdimension.jlawyer.client.mail.MailContentUI.recursiveLoadInlineImages(MailContentUI.java:1462) ~[j-lawyer-client.jar:?]
at com.jdimension.jlawyer.client.mail.MailContentUI.setMessageImpl(MailContentUI.java:1092) ~[j-lawyer-client.jar:?]
at com.jdimension.jlawyer.client.mail.MailContentUI.setMessage(MailContentUI.java:1005) [j-lawyer-client.jar:?]
at com.jdimension.jlawyer.client.mail.EmailInboxPanel.displayMessage(EmailInboxPanel.java:2405) [j-lawyer-client.jar:?]
at com.jdimension.jlawyer.client.mail.EmailInboxPanel.tblMailsMouseClicked(EmailInboxPanel.java:1676) [j-lawyer-client.jar:?]
at com.jdimension.jlawyer.client.mail.EmailInboxPanel$14.mouseClicked(EmailInboxPanel.java:1346) [j-lawyer-client.jar:?]
at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:278) [?:?]
at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:277) [?:?]
at java.awt.Component.processMouseEvent(Component.java:6638) [?:?]
at javax.swing.JComponent.processMouseEvent(JComponent.java:3342) [?:?]
at java.awt.Component.processEvent(Component.java:6400) [?:?]
at java.awt.Container.processEvent(Container.java:2263) [?:?]
at java.awt.Component.dispatchEventImpl(Component.java:5011) [?:?]
at java.awt.Container.dispatchEventImpl(Container.java:2321) [?:?]
at java.awt.Component.dispatchEvent(Component.java:4843) [?:?]
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918) [?:?]
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4556) [?:?]
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488) [?:?]
at java.awt.Container.dispatchEventImpl(Container.java:2307) [?:?]
at java.awt.Window.dispatchEventImpl(Window.java:2772) [?:?]
at java.awt.Component.dispatchEvent(Component.java:4843) [?:?]
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772) [?:?]
at java.awt.EventQueue$4.run(EventQueue.java:721) [?:?]
at java.awt.EventQueue$4.run(EventQueue.java:715) [?:?]
at java.security.AccessController.doPrivileged(Native Method) ~[?:?]
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) [?:?]
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95) [?:?]
at java.awt.EventQueue$5.run(EventQueue.java:745) [?:?]
at java.awt.EventQueue$5.run(EventQueue.java:743) [?:?]
at java.security.AccessController.doPrivileged(Native Method) ~[?:?]
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) [?:?]
at java.awt.EventQueue.dispatchEvent(EventQueue.java:742) [?:?]
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203) [?:?]
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124) [?:?]
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113) [?:?]
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109) [?:?]
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) [?:?]
at java.awt.EventDispatchThread.run(EventDispatchThread.java:90) [?:?]