Use of get POP3 mails activity for mail delivery system

I’m trying to create a robot to handle ​undelivered mails from company services.
All mail delivery service error messages are collected in a specific email address.
The messages show all the data (subject, body, attachments, …) about the undelivered mail when opened using the UI.
However, using the get POP3 mail messages activity I’m able to gather only a synthetical body “The following message to was undeliverable.”.
The robot needs to read the original mail subject to classify them.
Anyone with a similar problem? How could I get that information?
Thank you

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