Adapter Mail Sender - Error interpreting Mail from "@terra.com.br" server. (java.lang.ClassCastException: class java.lang.String:null)

Hi!

I'm facing the following problem:

A vendor send us an email, but when the adapter try to read that email, i receive the following message in Communication Channels Monitoring:

exception caught during processing mail message[16]; java.lang.ClassCastException: class java.lang.String:null incompatible with interface com.sap.guid.IGUID:com.sap.engine.core.service630.container.ComponentClassLoader@eb4d977@library:com.sap.guid.

I've made some tests with others mails but only those that came from "@terra.com.br" gave me that message.

Any suggestions?

Best Reggards,

Guilherme Mairene Rodrigues