Do you mean that you sent an email that was composed in MS Outlook? If so, did you format it using the standard word tools available in MS Outlook?
If that's the case, it is likely that the layout will not be the same for all recipients as it is dependent on the end receiver having the same system set up as yourself
The other problem that can arise is if you compose a word document and with it open, you elect to send it to an email recipient. By selecting this option, a new email window opens. In my experience it is very hit and miss and you are unlikely to have the exact same layout as that which you have composed. I would always send a separate word document as an attachment in an email if I have cause to send a letter as suggested above.