What release are you running? We’ve had lots of problems with attachments in 6.5.x including specific attachments able to crash the Domino server (nothing like a free denial of service attack feature from the vendor).
The majority that we’ve seen are address 6.5.4 with the latest DWA hotfix. We’re at 6.5.4FP1 HF6 + an iNotes hotfix on top of that.
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