What is the meaning of this warning log in inbound email attachment?

[grainer24]

Hello,
We encountered a scenario wherein an attachment were not successfully attached in the inbound email. And we can see this message in logs,

Do you know of any possible cause for this error?
Regards,
Rainer

[Community Alums]

Hi @grainer24 ,

For your troubleshooting, please refer below:

https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB1386146

https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB0538138

[grainer24]

Hello,
We checked on the references you've given but we still cannot trace the cause for those errors.
Regards
rainer