In Outlook, the size of an email in RTF format is much larger than that in HTML format.
![Figure: The different size of the same mail in two formats](https://bettersoftwaresuggestions.com/wp-content/uploads/2015/12/Outlook_RemoveRTF_1.gif)
Figure: The different size of the same mail in two formats
So we suggest: remove the RTF option in the message format to save space and make emails faster.
![Figure: Here to select the message format](https://bettersoftwaresuggestions.com/wp-content/uploads/2015/12/Outlook_RemoveRTF_2.gif)
Figure: Here to select the message format