I presume you are composing in html and using the Formatting Bar to set colour and formatting options. OR are you copy pasting text from a word processing package? This is not a good idea as not all formatting options available in Word processing software are available in the HTML. I also presume you are sending the email in both html and plain text. Are you using a standard universal font which the recipient is likely to have on their computer? some helpful links: * https://support.sendgrid.com/hc/en-us/articles/200184928-HTML-Rendering-The-Do-s-and-Dont-s-of-Cross-Platform-Email-Design * http://kb.mailchimp.com/campaigns/previews-and-tests/my-campaign-looks-bad-in-outlook * http://robcubbon.com/create-html-email-newsletters-outlook/ * http://www.verticalresponse.com/blog/its-not-you-its-outlook-the-complete-guide-for-email-marketers/ I would advise that if you creating complicated emails to send information that would be better in a eg: word document, then keep the email more simple and attach the document. Then the attached document can be read by the recipient using the correct software. So that they can read the data as you intended. Anyone can set up their computer to preferred viewing options, which can change the way the message is displayed. So they would need to find out what settings they are using which is changing the formatting. if they view using Plain Text then all formatting is stripped. Are they viewing using Original Html option or Rich Text? Are they using the wrong character encoding? This is not the place to try and work out what they are doing on a product not supported in this forum. Some helpful sites for Outlook: https://litmus.com/blog/a-guide-to-rendering-differences-in-microsoft-outlook-clients http://www.sitepoint.com/microsoft-breaks-html-email-rendering-in-outlook/