Hello @IDSER.Support and @Blueprint4SummerS ,
Check your Outlook settings for font sizing or anything else that would affect its font size. Outlook's many versions have a myriad of display settings that can drastically change how images, text, and even coloring display. Since Outlook uses Microsoft Word to render HTML, while nearly every other email program uses systems dedicated to rendering such coding, it can cause some differences that simply cannot be fixed, which has also affected other ESPs beyond us.
If you continue to encounter issues with how your text appears, I'd advise reaching out to Microsoft / Outlook's support channels and resources to see if they can identify what's forcing the text to appear improperly.
See also:
Display Issues – Why does my email look different when received?
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