Problem with Email Smart Service: fail to process attachments

Hi all,

Recently been facing issues with the Email Smart Service. Often, it will fail to send an email if there are multiple attachments (PDFs). Has anyone faced issues with it before where it says "failed to process attachments" although the documents are available? It's causing me a major headache, so I'm thankful for all kinds of input.

Thanks in advance,

Matthias 

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