Alterar a codificação para UTF-8 deve resolver o problema.
How to prevent Outlook 2010 and 2013 from adding line breaks to sent plain text messages
When you send a plain text message, by default, Outlook will wrap text and insert line breaks at 76 characters. This might break your formatted paragraphs and URL links.
There is a solution which requires registry changes, however there also an option that fixes it without touching the registry. Here are the steps:
- Click on the File tab and select Options.
- Click on “Advanced” in the left column of the Options window.
- Scroll down to the “International Options” section.
- Change “Preferred encoding for outgoing messages” to “Unicode (UTF-8)”.
- Click “OK” at the bottom of the Options window.
- Restart Outlook
That should do it.
Note: This only works for Outlook 2013 and 2010.