An attachment does not appear in a Plain Text Outlook E-mail
When you attach a file to a message that’s formatted as plain text in Microsoft Outlook 2016, the attachment does not appear in the Attached line in the message header. This problem occurs on a Microsoft Office 2016 Click-to-Run installation that has at least the December 11, 2015 update (version 16.0.6366.2036) installed.
This problem can also occur in other situations. This problem can occur if one or more of the following conditions are true:
- In the File > Options > Mail dialog box, the Compose messages in this format option is set to Plain Text.
- You are replying to or forwarding an email message that you received in plain text format. Outlook uses the format of the original message in a reply, even if the Compose messages in this format option is set to HTML.
- You manually change the format of the message to Plain Text.
- The message that has the attachment is generated by another program that uses Simple MAPI to create the message.
- You are sending a file from Windows Explorer or another file management program by right-clicking the file, pointing to Send to, and then selecting Mail recipient.