Once likely cause is sending the messages in Rich Text format. Only people
using Outlook cna see attachments to Rich Text messages. Make sure you're
sending HTML or Plain Text messages.
Open the contact record of one of those people and double-click the email
address. Do you see an "Internet format" drop-down at the bottom of the
dialogue? Does it say "Send using Outlook Rich Text format"? If so, that's
why. Change it to "Let Outlook decide..."
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