Specific Emails get Errors

Specific Emails get Errors

Hi,

We are using SDP 14.7 on-prem, reading emails on a dedicated mailbox.
We are experiencing issues with soem specific emails, that dont get processed.
They are stuck in the Inbox, dont get moved to the Errors folder, and dont alert me (even though the options are enabed).
In System Log Viewer, i am getting this error:

An error occurred while processing an email
Error in accessing a mail[9]. 
Subject of the mail : testmail

There is nothing special about these emails, why are they stuck?

Thank you.


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