3477409 - Mail Adapter issue after system update

• After system update to 7.50 SP 27 the Mail Adapter is no longer working
• From the debug traces the following can be observed: 
  Mail: Error occurred: java.lang.NullPointerException: while trying to invoke the method com.sap.aii.af.sdk.xi.mo.ximail.MailReceipt.marshal(com.sap.aii.af.sdk.xi.util.XMLWriter) of a null object loaded from local variable receipt
  
  Mail: Error occurred: com.sap.aii.af.lib.mp.module.ModuleException
  MP: exception caught with cause com.sap.aii.af.sdk.xi.srt.BubbleException: Failed to call the endpoint  [null "null"]; nested exception caused by: java.lang.NullPointerException: while trying to invoke the method com.sap.aii.af.sdk.xi.mo.ximail.MailReceipt.marshal(com.sap.aii.af.sdk.xi.util.XMLWriter) of a null object loaded from local variable 'receipt'
  
  Transmitting the message to endpoint <local> using connection OFTP_http://sap.com/xi/XI/OFTP failed, due to: com.sap.engine.interfaces.messaging.api.exception.MessagingException: com.sap.aii.af.sdk.xi.srt.BubbleException: Failed to call the endpoint  [null "null"]; nested exception caused by: java.lang.NullPointerException: while trying to invoke the method com.sap.aii.af.sdk.xi.mo.ximail.MailReceipt.marshal(com.sap.aii.af.sdk.xi.util.XMLWriter) of a null object loaded from local variable 'receipt'".

• SAP NetWeaver
• SAP Process Orchestration
• SAP Process Integration 

Process Integration 7.5, Process Orchestration 7.5, PI 7.5, PO 7.5, SMTP, SMTPS, Basic Authentication, Mail Adapter Receiver, Null Pointer , KBA , BC-XI-CON-MAI , Mail Adapter , Problem