Continuing the discussion from Incoming emails with attachments are not processed:
It appears that when an attachment is stripped off (e.g., because it’s not on the approved file type list) the user is never notified that the attachment did not go through.
This causes users to think/assume we got their attachment when in fact it never got included in their post.
Stripping attachments should notify the user (similar to a failed post due to address mismatch or other problems) that the attachment was not included because the file type is not allowed. (Or too big, etc.)