3344521 - Mail Adapter shows the error "javax.mail.MessagingException: Unable to load BODYSTRUCTURE"

You are using Mail Adapter in Process Orchestration to fetch emails from an email server. For specific sender addresses and specific emails the following error is displayed in the Communication Channel Monitor:

javax.mail.MessagingException: Unable to load BODYSTRUCTURE

After collecting XPI Inspector trace Example 100 with tracing location com.sap.aii.adapter.mail you see the following stack trace:

javax.mail.MessagingException: Unable to load BODYSTRUCTURE
at com.sun.mail.imap.IMAPMessage.loadBODYSTRUCTURE(IMAPMessage.java:1488)
at com.sun.mail.imap.IMAPMessage.getContentType(IMAPMessage.java:556)
at javax.mail.internet.MimeBodyPart.isMimeType(MimeBodyPart.java:1159)
at javax.mail.internet.MimeMessage.isMimeType(MimeMessage.java:1016)
at com.sap.aii.af.sdk.xi.net.IMAPClientConnection.getTextFromMessage(IMAPClientConnection.java:605)
at com.sap.aii.af.sdk.xi.net.IMAPClientConnection.parseOAuthMails(IMAPClientConnection.java:502)
at com.sap.aii.af.sdk.xi.srt.xmb.XMBIMAPInitiatorServiceImpl$MailClientTask.invoke(XMBIMAPInitiatorServiceImpl.java:607)
at com.sap.aii.af.lib.scheduler.JobBroker$Worker.run(JobBroker.java:529)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(Native Method)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:185)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:302)

SAP PO 7.50, SAP PI 7.50

BODYSTRUCTURE, Unable to load BODYSTRUCTURE, Mail Adapter, Mail, SMTP, , KBA , BC-XI-CON-MAI , Mail Adapter , Problem