How to prevent inline attachments in Outlook?
Have you noticed that sometimes when you inserting an attachment to the email message, the attachment will be inserted to the email body automatically not the Attached filed? That may be you applied the Rich Text format in your Outlook.

For preventing inline attachments in Outlook, you can do with the following article shows.
Prevent inline attachments in all outgoing email messages in Outlook 2010 and 2013
Prevent inline attachments in all outgoing email messages in Outlook 2007
Prevent inline attachments in an outgoing email message in Outlook
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Prevent inline attachments in all outgoing email messages in Outlook 2010 and 2013
To prevent inline attachments in all outgoing email messages, you need to change all outgoing email format to HTML or Plain Text format.
1. Please click File > Options.

2. In the Outlook Options dialog box, please click Mail in the left bar, then go to the Compose messages section to choose HTML or Plain Text as you need from the Compose messages in this format drop down list See screenshot:

3. Click OK button.
Then when you inserting attachments in Outlook email message, it will be inserted to the Attached filed automatically.
Prevent inline attachments in all outgoing email messages in Outlook 2007
In Outlook 2007, please do as follows.
1. Please click Tools > Options.

2. In the Options dialog box, please click the Mail Format tab. Then select HTML or Plain Text in the Message format section, and click the OK button.

Prevent inline attachments in an outgoing email message in Outlook
For preventing inline attachments in an outgoing email message, please do as follows.
1. In the Message window, please click Aa HTML or Plain Text in the Format group under Format Text tab.

In Outlook 2007, please click Aa HTML or Plain Text under Options tab.
You can see the inline attachment is moved to the Attached field automatically after clicking Aa HTML or Plain Text.
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